21122401055524 has 24 divisors (see below), whose sum is σ = 37368208882368. Its totient is φ = 10446017920800.

The previous prime is 21122401055521. The next prime is 21122401055531. The reversal of 21122401055524 is 42555010422112.

It is a self number, because there is not a number n which added to its sum of digits gives 21122401055524.

It is not an unprimeable number, because it can be changed into a prime (21122401055521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30655627 + ... + 31337074.

It is an arithmetic number, because the mean of its divisors is an integer number (1557008703432).

Almost surely, 2^{21122401055524} is an apocalyptic number.

It is an amenable number.

21122401055524 is a deficient number, since it is larger than the sum of its proper divisors (16245807826844).

21122401055524 is a wasteful number, since it uses less digits than its factorization.

21122401055524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61993635 (or 61993633 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 34.

Adding to 21122401055524 its reverse (42555010422112), we get a palindrome (63677411477636).

The spelling of 21122401055524 in words is "twenty-one trillion, one hundred twenty-two billion, four hundred one million, fifty-five thousand, five hundred twenty-four".