21696220122 has 16 divisors (see below), whose sum is σ = 43510680192. Its totient is φ = 7212366720.

The previous prime is 21696220103. The next prime is 21696220129. The reversal of 21696220122 is 22102269612.

It is not an unprimeable number, because it can be changed into a prime (21696220129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4924279 + ... + 4928682.

It is an arithmetic number, because the mean of its divisors is an integer number (2719417512).

Almost surely, 2^21696220122 is an apocalyptic number.

21696220122 is an abundant number, since it is smaller than the sum of its proper divisors (21814460070).

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

21696220122 is a wasteful number, since it uses less digits than its factorization.

21696220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9853333.

The product of its (nonzero) digits is 10368, while the sum is 33.

Adding to 21696220122 its reverse (22102269612), we get a palindrome (43798489734).

The spelling of 21696220122 in words is "twenty-one billion, six hundred ninety-six million, two hundred twenty thousand, one hundred twenty-two".