21311310022001 has 4 divisors (see below), whose sum is σ = 21327741256932. Its totient is φ = 21294878787072.

The previous prime is 21311310021973. The next prime is 21311310022027. The reversal of 21311310022001 is 10022001311312.

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 20553755640625 + 757554381376 = 4533625^2 + 870376^2 .

It is a cyclic number.

It is not a de Polignac number, because 21311310022001 - 2²⁶ = 21311242913137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311310022901) 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, 8215615520 + ... + 8215618113.

It is an arithmetic number, because the mean of its divisors is an integer number (5331935314233).

Almost surely, 2^{21311310022001} is an apocalyptic number.

It is an amenable number.

21311310022001 is a deficient number, since it is larger than the sum of its proper divisors (16431234931).

21311310022001 is a wasteful number, since it uses less digits than its factorization.

21311310022001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16431234930.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21311310022001 its reverse (10022001311312), we get a palindrome (31333311333313).

The spelling of 21311310022001 in words is "twenty-one trillion, three hundred eleven billion, three hundred ten million, twenty-two thousand, one".