21525770234456 has 128 divisors (see below), whose sum is σ = 42811247001600. Its totient is φ = 10126217333760.

The previous prime is 21525770234429. The next prime is 21525770234461. The reversal of 21525770234456 is 65443207752512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21525770234398 and 21525770234407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3432586601 + ... + 3432592871.

It is an arithmetic number, because the mean of its divisors is an integer number (334462867200).

Almost surely, 2^{21525770234456} is an apocalyptic number.

It is an amenable number.

21525770234456 is a deficient number, since it is larger than the sum of its proper divisors (21285476767144).

21525770234456 is a wasteful number, since it uses less digits than its factorization.

21525770234456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7449 (or 7445 counting only the distinct ones).

The product of its (nonzero) digits is 14112000, while the sum is 53.

Adding to 21525770234456 its reverse (65443207752512), we get a palindrome (86968977986968).

The spelling of 21525770234456 in words is "twenty-one trillion, five hundred twenty-five billion, seven hundred seventy million, two hundred thirty-four thousand, four hundred fifty-six".