21031220013001 has 4 divisors (see below), whose sum is σ = 22943149105104. Its totient is φ = 19119290920900.

The previous prime is 21031220012923. The next prime is 21031220013131. The reversal of 21031220013001 is 10031002213012.

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 21031220013001 - 2²⁷ = 21031085795273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031220014001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955964546035 + ... + 955964546056.

It is an arithmetic number, because the mean of its divisors is an integer number (5735787276276).

Almost surely, 2^{21031220013001} is an apocalyptic number.

It is an amenable number.

21031220013001 is a deficient number, since it is larger than the sum of its proper divisors (1911929092103).

21031220013001 is a wasteful number, since it uses less digits than its factorization.

21031220013001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911929092102.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21031220013001 its reverse (10031002213012), we get a palindrome (31062222226013).

The spelling of 21031220013001 in words is "twenty-one trillion, thirty-one billion, two hundred twenty million, thirteen thousand, one".