1921311577632 has 192 divisors, whose sum is σ = 5722901662464. Its totient is φ = 560974233600.

The previous prime is 1921311577597. The next prime is 1921311577667. The reversal of 1921311577632 is 2367751131291.

It is an interprime number because it is at equal distance from previous prime (1921311577597) and next prime (1921311577667).

It is a hoax number, since the sum of its digits (48) 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 (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 697132 + ... + 2080532.

It is an arithmetic number, because the mean of its divisors is an integer number (29806779492).

Almost surely, 2^{1921311577632} is an apocalyptic number.

1921311577632 is a gapful number since it is divisible by the number (12) 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 1921311577632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2861450831232).

1921311577632 is an abundant number, since it is smaller than the sum of its proper divisors (3801590084832).

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

1921311577632 is a wasteful number, since it uses less digits than its factorization.

1921311577632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383491 (or 1383483 counting only the distinct ones).

The product of its digits is 476280, while the sum is 48.

The spelling of 1921311577632 in words is "one trillion, nine hundred twenty-one billion, three hundred eleven million, five hundred seventy-seven thousand, six hundred thirty-two".