21125214102 has 16 divisors (see below), whose sum is σ = 42284989440. Its totient is φ = 7035977832.

The previous prime is 21125214083. The next prime is 21125214139. The reversal of 21125214102 is 20141252112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1432102 + ... + 1446777.

It is an arithmetic number, because the mean of its divisors is an integer number (2642811840).

Almost surely, 2^21125214102 is an apocalyptic number.

21125214102 is an abundant number, since it is smaller than the sum of its proper divisors (21159775338).

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

21125214102 is a wasteful number, since it uses less digits than its factorization.

21125214102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880107.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 21125214102 its reverse (20141252112), we get a palindrome (41266466214).

The spelling of 21125214102 in words is "twenty-one billion, one hundred twenty-five million, two hundred fourteen thousand, one hundred two".