21550122402 has 16 divisors (see below), whose sum is σ = 43288458240. Its totient is φ = 7152005232.

The previous prime is 21550122397. The next prime is 21550122413. The reversal of 21550122402 is 20422105512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7840738 + ... + 7843485.

It is an arithmetic number, because the mean of its divisors is an integer number (2705528640).

Almost surely, 2^21550122402 is an apocalyptic number.

21550122402 is an abundant number, since it is smaller than the sum of its proper divisors (21738335838).

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

21550122402 is a wasteful number, since it uses less digits than its factorization.

21550122402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15684457.

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 21550122402 its reverse (20422105512), we get a palindrome (41972227914).

The spelling of 21550122402 in words is "twenty-one billion, five hundred fifty million, one hundred twenty-two thousand, four hundred two".