21015050361 has 32 divisors (see below), whose sum is σ = 30963202560. Its totient is φ = 12618461184.

The previous prime is 21015050347. The next prime is 21015050363. The reversal of 21015050361 is 16305051012.

It is not a de Polignac number, because 21015050361 - 2¹⁸ = 21014788217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21015050363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104256 + ... + 229998.

It is an arithmetic number, because the mean of its divisors is an integer number (967600080).

Almost surely, 2^21015050361 is an apocalyptic number.

It is an amenable number.

21015050361 is a deficient number, since it is larger than the sum of its proper divisors (9948152199).

21015050361 is a wasteful number, since it uses less digits than its factorization.

21015050361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125905.

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 21015050361 in words is "twenty-one billion, fifteen million, fifty thousand, three hundred sixty-one".