1391421265920 has 2304 divisors, whose sum is σ = 6264156487680. Its totient is φ = 288947699712.

The previous prime is 1391421265909. The next prime is 1391421265979. The reversal of 1391421265920 is 295621241931.

It is a happy number.

1391421265920 is a `hidden beast` number, since 1 + 3 + 9 + 1 + 42 + 12 + 6 + 592 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2304).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 10956072897 + ... + 10956073023.

It is an arithmetic number, because the mean of its divisors is an integer number (2718817920).

Almost surely, 2^{1391421265920} is an apocalyptic number.

1391421265920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391421265920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3132078243840).

1391421265920 is an abundant number, since it is smaller than the sum of its proper divisors (4872735221760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1391421265920 is a wasteful number, since it uses less digits than its factorization.

1391421265920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 1391421265920 in words is "one trillion, three hundred ninety-one billion, four hundred twenty-one million, two hundred sixty-five thousand, nine hundred twenty".