21152520123110 has 32 divisors (see below), whose sum is σ = 39303284984064. Its totient is φ = 8187960240000.

The previous prime is 21152520123101. The next prime is 21152520123139. The reversal of 21152520123110 is 1132102525112.

It is a self number, because there is not a number n which added to its sum of digits gives 21152520123110.

It is a congruent number.

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, 24342320 + ... + 25196300.

It is an arithmetic number, because the mean of its divisors is an integer number (1228227655752).

Almost surely, 2^{21152520123110} is an apocalyptic number.

21152520123110 is a deficient number, since it is larger than the sum of its proper divisors (18150764860954).

21152520123110 is a wasteful number, since it uses less digits than its factorization.

21152520123110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933920.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 21152520123110 its reverse (1132102525112), we get a palindrome (22284622648222).

The spelling of 21152520123110 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred twenty million, one hundred twenty-three thousand, one hundred ten".