21013031201 has 4 divisors (see below), whose sum is σ = 21119696532. Its totient is φ = 20906365872.

The previous prime is 21013031161. The next prime is 21013031243. The reversal of 21013031201 is 10213031012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14480512225 + 6532518976 = 120335^2 + 80824^2 .

It is a cyclic number.

It is not a de Polignac number, because 21013031201 - 2¹⁰ = 21013030177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013031261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53332370 + ... + 53332763.

It is an arithmetic number, because the mean of its divisors is an integer number (5279924133).

Almost surely, 2^21013031201 is an apocalyptic number.

It is an amenable number.

21013031201 is a deficient number, since it is larger than the sum of its proper divisors (106665331).

21013031201 is a wasteful number, since it uses less digits than its factorization.

21013031201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106665330.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21013031201 its reverse (10213031012), we get a palindrome (31226062213).

The spelling of 21013031201 in words is "twenty-one billion, thirteen million, thirty-one thousand, two hundred one".