21562400100056 has 16 divisors (see below), whose sum is σ = 40697245224240. Its totient is φ = 10709801373600.

The previous prime is 21562400100037. The next prime is 21562400100077. The reversal of 21562400100056 is 65000100426512.

It is a super-2 number, since 2×21562400100056² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21562400099995 and 21562400100031.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8924833271 + ... + 8924835686.

It is an arithmetic number, because the mean of its divisors is an integer number (2543577826515).

Almost surely, 2^{21562400100056} is an apocalyptic number.

It is an amenable number.

21562400100056 is a deficient number, since it is larger than the sum of its proper divisors (19134845124184).

21562400100056 is a wasteful number, since it uses less digits than its factorization.

21562400100056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17849669114 (or 17849669110 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21562400100056 its reverse (65000100426512), we get a palindrome (86562500526568).

The spelling of 21562400100056 in words is "twenty-one trillion, five hundred sixty-two billion, four hundred million, one hundred thousand, fifty-six".