21051501122 has 4 divisors (see below), whose sum is σ = 31577251686. Its totient is φ = 10525750560.

The previous prime is 21051501101. The next prime is 21051501139. The reversal of 21051501122 is 22110515012.

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., 18534371881 + 2517129241 = 136141^2 + 50171^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21051501094 and 21051501103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5262875279 + ... + 5262875282.

Almost surely, 2^21051501122 is an apocalyptic number.

21051501122 is a deficient number, since it is larger than the sum of its proper divisors (10525750564).

21051501122 is a wasteful number, since it uses less digits than its factorization.

21051501122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10525750563.

The product of its (nonzero) digits is 200, while the sum is 20.

The spelling of 21051501122 in words is "twenty-one billion, fifty-one million, five hundred one thousand, one hundred twenty-two".