21151318201 has 12 divisors (see below), whose sum is σ = 22909275900. Its totient is φ = 19519368960.

The previous prime is 21151318183. The next prime is 21151318207. The reversal of 21151318201 is 10281315112.

It can be written as a sum of positive squares in 6 ways, for example, as 1740141225 + 19411176976 = 41715^2 + 139324^2 .

It is not a de Polignac number, because 21151318201 - 2³³ = 12561383609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21151318207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 772221 + ... + 799141.

It is an arithmetic number, because the mean of its divisors is an integer number (1909106325).

Almost surely, 2^21151318201 is an apocalyptic number.

It is an amenable number.

21151318201 is a deficient number, since it is larger than the sum of its proper divisors (1757957699).

21151318201 is a wasteful number, since it uses less digits than its factorization.

21151318201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31596 (or 31583 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 25.

The spelling of 21151318201 in words is "twenty-one billion, one hundred fifty-one million, three hundred eighteen thousand, two hundred one".