21253223534604 has 24 divisors (see below), whose sum is σ = 49621148701488. Its totient is φ = 7080080160960.

The previous prime is 21253223534551. The next prime is 21253223534629. The reversal of 21253223534604 is 40643532235212.

It is a super-2 number, since 2×21253223534604² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540940027 + ... + 540979314.

It is an arithmetic number, because the mean of its divisors is an integer number (2067547862562).

Almost surely, 2^{21253223534604} is an apocalyptic number.

It is an amenable number.

21253223534604 is an abundant number, since it is smaller than the sum of its proper divisors (28367925166884).

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

21253223534604 is a wasteful number, since it uses less digits than its factorization.

21253223534604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081920985 (or 1081920983 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 42.

Adding to 21253223534604 its reverse (40643532235212), we get a palindrome (61896755769816).

The spelling of 21253223534604 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred twenty-three million, five hundred thirty-four thousand, six hundred four".