21123551122 has 8 divisors (see below), whose sum is σ = 32119372476. Its totient is φ = 10417093632.

The previous prime is 21123550967. The next prime is 21123551143. The reversal of 21123551122 is 22115532112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21063007161 + 60543961 = 145131^2 + 7781^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72340783 + ... + 72341074.

Almost surely, 2^21123551122 is an apocalyptic number.

21123551122 is a deficient number, since it is larger than the sum of its proper divisors (10995821354).

21123551122 is a wasteful number, since it uses less digits than its factorization.

21123551122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144681932.

The product of its digits is 1200, while the sum is 25.

The spelling of 21123551122 in words is "twenty-one billion, one hundred twenty-three million, five hundred fifty-one thousand, one hundred twenty-two".