1055721564381 has 32 divisors (see below), whose sum is σ = 1630019991168. Its totient is φ = 600677130240.

The previous prime is 1055721564371. The next prime is 1055721564451. The reversal of 1055721564381 is 1834651275501.

It is not a de Polignac number, because 1055721564381 - 2¹⁰ = 1055721563357 is a prime.

It is a super-2 number, since 2×1055721564381² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1055721564381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055721564371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2147380 + ... + 2592813.

It is an arithmetic number, because the mean of its divisors is an integer number (50938124724).

Almost surely, 2^{1055721564381} is an apocalyptic number.

1055721564381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1055721564381 is a deficient number, since it is larger than the sum of its proper divisors (574298426787).

1055721564381 is a wasteful number, since it uses less digits than its factorization.

1055721564381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4740621.

The product of its (nonzero) digits is 1008000, while the sum is 48.

The spelling of 1055721564381 in words is "one trillion, fifty-five billion, seven hundred twenty-one million, five hundred sixty-four thousand, three hundred eighty-one".