21350636121 has 16 divisors (see below), whose sum is σ = 29709379584. Its totient is φ = 13612997904.

The previous prime is 21350636119. The next prime is 21350636183. The reversal of 21350636121 is 12163605312.

It is not a de Polignac number, because 21350636121 - 2¹ = 21350636119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21350636191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 608560 + ... + 642686.

It is an arithmetic number, because the mean of its divisors is an integer number (1856836224).

Almost surely, 2^21350636121 is an apocalyptic number.

It is an amenable number.

21350636121 is a deficient number, since it is larger than the sum of its proper divisors (8358743463).

21350636121 is a wasteful number, since it uses less digits than its factorization.

21350636121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43220.

The product of its (nonzero) digits is 6480, while the sum is 30.

The spelling of 21350636121 in words is "twenty-one billion, three hundred fifty million, six hundred thirty-six thousand, one hundred twenty-one".