21002022311 has 4 divisors (see below), whose sum is σ = 21162343224. Its totient is φ = 20841701400.

The previous prime is 21002022299. The next prime is 21002022323. The reversal of 21002022311 is 11322020012.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21002022299) and next prime (21002022323).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002022311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002022211) 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, 80160260 + ... + 80160521.

It is an arithmetic number, because the mean of its divisors is an integer number (5290585806).

Almost surely, 2^21002022311 is an apocalyptic number.

21002022311 is a deficient number, since it is larger than the sum of its proper divisors (160320913).

21002022311 is a wasteful number, since it uses less digits than its factorization.

21002022311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160320912.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21002022311 its reverse (11322020012), we get a palindrome (32324042323).

The spelling of 21002022311 in words is "twenty-one billion, two million, twenty-two thousand, three hundred eleven".