1021956559440 has 80 divisors (see below), whose sum is σ = 3277308988800. Its totient is φ = 263124445696.

The previous prime is 1021956559433. The next prime is 1021956559453. The reversal of 1021956559440 is 449556591201.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1021956559440² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73409460 + ... + 73423379.

It is an arithmetic number, because the mean of its divisors is an integer number (40966362360).

Almost surely, 2^{1021956559440} is an apocalyptic number.

1021956559440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021956559440 is an abundant number, since it is smaller than the sum of its proper divisors (2255352429360).

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

1021956559440 is a wasteful number, since it uses less digits than its factorization.

1021956559440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146832884 (or 146832878 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 51.

The spelling of 1021956559440 in words is "one trillion, twenty-one billion, nine hundred fifty-six million, five hundred fifty-nine thousand, four hundred forty".