21521452531010 has 32 divisors (see below), whose sum is σ = 39747522431232. Its totient is φ = 8385470271360.

The previous prime is 21521452531003. The next prime is 21521452531021. The reversal of 21521452531010 is 1013525412512.

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, 68030051 + ... + 68345670.

It is an arithmetic number, because the mean of its divisors is an integer number (1242110075976).

Almost surely, 2^{21521452531010} is an apocalyptic number.

21521452531010 is a deficient number, since it is larger than the sum of its proper divisors (18226069900222).

21521452531010 is a wasteful number, since it uses less digits than its factorization.

21521452531010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136376138.

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 21521452531010 its reverse (1013525412512), we get a palindrome (22534977943522).

The spelling of 21521452531010 in words is "twenty-one trillion, five hundred twenty-one billion, four hundred fifty-two million, five hundred thirty-one thousand, ten".