1021001397120 has 384 divisors, whose sum is σ = 3671530742880. Its totient is φ = 271127347200.

The previous prime is 1021001397089. The next prime is 1021001397131. The reversal of 1021001397120 is 217931001201.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37466700 + ... + 37493940.

Almost surely, 2^{1021001397120} is an apocalyptic number.

1021001397120 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 1021001397120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1835765371440).

1021001397120 is an abundant number, since it is smaller than the sum of its proper divisors (2650529345760).

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

1021001397120 is an equidigital number, since it uses as much as digits as its factorization.

1021001397120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27516 (or 27492 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

Adding to 1021001397120 its reverse (217931001201), we get a palindrome (1238932398321).

The spelling of 1021001397120 in words is "one trillion, twenty-one billion, one million, three hundred ninety-seven thousand, one hundred twenty".