21125242315102 has 32 divisors (see below), whose sum is σ = 32196758330880. Its totient is φ = 10393347634560.

The previous prime is 21125242315097. The next prime is 21125242315127. The reversal of 21125242315102 is 20151324252112.

It is a super-2 number, since 2×21125242315102² (a number of 27 digits) contains 22 as substring.

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, 542056477 + ... + 542095447.

It is an arithmetic number, because the mean of its divisors is an integer number (1006148697840).

Almost surely, 2^{21125242315102} is an apocalyptic number.

21125242315102 is a deficient number, since it is larger than the sum of its proper divisors (11071516015778).

21125242315102 is a wasteful number, since it uses less digits than its factorization.

21125242315102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43456.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 21125242315102 its reverse (20151324252112), we get a palindrome (41276566567214).

The spelling of 21125242315102 in words is "twenty-one trillion, one hundred twenty-five billion, two hundred forty-two million, three hundred fifteen thousand, one hundred two".