21702145122 has 48 divisors (see below), whose sum is σ = 53747378880. Its totient is φ = 6199605216.

The previous prime is 21702145117. The next prime is 21702145139. The reversal of 21702145122 is 22154120712.

It is a happy number.

21702145122 is a `hidden beast` number, since 2 + 170 + 21 + 451 + 22 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1141329 + ... + 1160187.

It is an arithmetic number, because the mean of its divisors is an integer number (1119737060).

Almost surely, 2^21702145122 is an apocalyptic number.

21702145122 is an abundant number, since it is smaller than the sum of its proper divisors (32045233758).

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

21702145122 is a wasteful number, since it uses less digits than its factorization.

21702145122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28007 (or 28004 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

Adding to 21702145122 its reverse (22154120712), we get a palindrome (43856265834).

The spelling of 21702145122 in words is "twenty-one billion, seven hundred two million, one hundred forty-five thousand, one hundred twenty-two".