21504105552522 has 32 divisors (see below), whose sum is σ = 43325085268224. Its totient is φ = 7115229939200.

The previous prime is 21504105552491. The next prime is 21504105552569. The reversal of 21504105552522 is 22525550140512.

It is a super-2 number, since 2×21504105552522² (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 15 ways as a sum of consecutive naturals, for example, 11309122 + ... + 13073042.

It is an arithmetic number, because the mean of its divisors is an integer number (1353908914632).

Almost surely, 2^{21504105552522} is an apocalyptic number.

21504105552522 is an abundant number, since it is smaller than the sum of its proper divisors (21820979715702).

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

21504105552522 is a wasteful number, since it uses less digits than its factorization.

21504105552522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778894.

The product of its (nonzero) digits is 200000, while the sum is 39.

The spelling of 21504105552522 in words is "twenty-one trillion, five hundred four billion, one hundred five million, five hundred fifty-two thousand, five hundred twenty-two".