21221364266511 has 8 divisors (see below), whose sum is σ = 28306888222464. Its totient is φ = 14141708244120.

The previous prime is 21221364266477. The next prime is 21221364266521. The reversal of 21221364266511 is 11566246312212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21221364266511 - 2¹⁸ = 21221364004367 is a prime.

It is a super-2 number, since 2×21221364266511² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221364266521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1466974951 + ... + 1466989416.

It is an arithmetic number, because the mean of its divisors is an integer number (3538361027808).

Almost surely, 2^{21221364266511} is an apocalyptic number.

21221364266511 is a deficient number, since it is larger than the sum of its proper divisors (7085523955953).

21221364266511 is a wasteful number, since it uses less digits than its factorization.

21221364266511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933966781.

The product of its digits is 207360, while the sum is 42.

The spelling of 21221364266511 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred sixty-four million, two hundred sixty-six thousand, five hundred eleven".