21310611011 has 4 divisors (see below), whose sum is σ = 21389248224. Its totient is φ = 21231973800.

The previous prime is 21310610989. The next prime is 21310611013. The reversal of 21310611011 is 11011601312.

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

It is a cyclic number.

It is not a de Polignac number, because 21310611011 - 2¹⁰ = 21310609987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310611013) 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, 39318200 + ... + 39318741.

It is an arithmetic number, because the mean of its divisors is an integer number (5347312056).

Almost surely, 2^21310611011 is an apocalyptic number.

21310611011 is a deficient number, since it is larger than the sum of its proper divisors (78637213).

21310611011 is an equidigital number, since it uses as much as digits as its factorization.

21310611011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78637212.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 21310611011 in words is "twenty-one billion, three hundred ten million, six hundred eleven thousand, eleven".