21990362711 has 4 divisors (see below), whose sum is σ = 21990731112. Its totient is φ = 21989994312.

The previous prime is 21990362623. The next prime is 21990362729. The reversal of 21990362711 is 11726309912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21990362711 is a prime.

It is a super-2 number, since 2×21990362711² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21990362731) 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, 71801 + ... + 221666.

It is an arithmetic number, because the mean of its divisors is an integer number (5497682778).

Almost surely, 2^21990362711 is an apocalyptic number.

21990362711 is a deficient number, since it is larger than the sum of its proper divisors (368401).

21990362711 is an equidigital number, since it uses as much as digits as its factorization.

21990362711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368400.

The product of its (nonzero) digits is 40824, while the sum is 41.

The spelling of 21990362711 in words is "twenty-one billion, nine hundred ninety million, three hundred sixty-two thousand, seven hundred eleven".