21131000122 has 4 divisors (see below), whose sum is σ = 31696500186. Its totient is φ = 10565500060.

The previous prime is 21131000083. The next prime is 21131000141. The reversal of 21131000122 is 22100013112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15316785121 + 5814215001 = 123761^2 + 76251^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5282750029 + ... + 5282750032.

Almost surely, 2^21131000122 is an apocalyptic number.

21131000122 is a deficient number, since it is larger than the sum of its proper divisors (10565500064).

21131000122 is a wasteful number, since it uses less digits than its factorization.

21131000122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10565500063.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21131000122 its reverse (22100013112), we get a palindrome (43231013234).

The spelling of 21131000122 in words is "twenty-one billion, one hundred thirty-one million, one hundred twenty-two", and thus it is an aban number.