21356347611 has 16 divisors (see below), whose sum is σ = 28876694400. Its totient is φ = 14036938560.

The previous prime is 21356347603. The next prime is 21356347633. The reversal of 21356347611 is 11674365312.

It is not a de Polignac number, because 21356347611 - 2³ = 21356347603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21356347611.

It is not an unprimeable number, because it can be changed into a prime (21356347811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 573016 + ... + 609146.

It is an arithmetic number, because the mean of its divisors is an integer number (1804793400).

Almost surely, 2^21356347611 is an apocalyptic number.

21356347611 is a deficient number, since it is larger than the sum of its proper divisors (7520346789).

21356347611 is a wasteful number, since it uses less digits than its factorization.

21356347611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38906.

The product of its digits is 90720, while the sum is 39.

The spelling of 21356347611 in words is "twenty-one billion, three hundred fifty-six million, three hundred forty-seven thousand, six hundred eleven".