21013013201 has 4 divisors (see below), whose sum is σ = 21014843904. Its totient is φ = 21011182500.

The previous prime is 21013013167. The next prime is 21013013209. The reversal of 21013013201 is 10231031012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21013013201 - 2²⁶ = 20945904337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013013209) 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, 898025 + ... + 921126.

It is an arithmetic number, because the mean of its divisors is an integer number (5253710976).

Almost surely, 2^21013013201 is an apocalyptic number.

It is an amenable number.

21013013201 is a deficient number, since it is larger than the sum of its proper divisors (1830703).

21013013201 is a wasteful number, since it uses less digits than its factorization.

21013013201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830702.

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

Adding to 21013013201 its reverse (10231031012), we get a palindrome (31244044213).

The spelling of 21013013201 in words is "twenty-one billion, thirteen million, thirteen thousand, two hundred one".