21213525104442 has 48 divisors (see below), whose sum is σ = 52321105407168. Its totient is φ = 6148847855040.

The previous prime is 21213525104441. The next prime is 21213525104501. The reversal of 21213525104442 is 24440152531212.

21213525104442 is a `hidden beast` number, since 2 + 1 + 2 + 13 + 52 + 510 + 44 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21213525104397 and 21213525104406.

It is not an unprimeable number, because it can be changed into a prime (21213525104441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2329104483 + ... + 2329113590.

It is an arithmetic number, because the mean of its divisors is an integer number (1090023029316).

Almost surely, 2^{21213525104442} is an apocalyptic number.

21213525104442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21213525104442 is an abundant number, since it is smaller than the sum of its proper divisors (31107580302726).

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

21213525104442 is a wasteful number, since it uses less digits than its factorization.

21213525104442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4658218115 (or 4658218112 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

Adding to 21213525104442 its reverse (24440152531212), we get a palindrome (45653677635654).

The spelling of 21213525104442 in words is "twenty-one trillion, two hundred thirteen billion, five hundred twenty-five million, one hundred four thousand, four hundred forty-two".