21013312001 has 4 divisors (see below), whose sum is σ = 22923613104. Its totient is φ = 19103010900.

The previous prime is 21013311983. The next prime is 21013312007. The reversal of 21013312001 is 10021331012.

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 21013312001 - 2¹⁰ = 21013310977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013312007) 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, 955150535 + ... + 955150556.

It is an arithmetic number, because the mean of its divisors is an integer number (5730903276).

Almost surely, 2^21013312001 is an apocalyptic number.

It is an amenable number.

21013312001 is a deficient number, since it is larger than the sum of its proper divisors (1910301103).

21013312001 is a wasteful number, since it uses less digits than its factorization.

21013312001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910301102.

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

Adding to 21013312001 its reverse (10021331012), we get a palindrome (31034643013).

The spelling of 21013312001 in words is "twenty-one billion, thirteen million, three hundred twelve thousand, one".