21366437726706 has 32 divisors (see below), whose sum is σ = 44399464113600. Its totient is φ = 6846526034880.

The previous prime is 21366437726701. The next prime is 21366437726749. The reversal of 21366437726706 is 60762773466312.

It is a super-2 number, since 2×21366437726706² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21366437726706.

It is not an unprimeable number, because it can be changed into a prime (21366437726701) 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, 268072860 + ... + 268152551.

It is an arithmetic number, because the mean of its divisors is an integer number (1387483253550).

Almost surely, 2^{21366437726706} is an apocalyptic number.

21366437726706 is an abundant number, since it is smaller than the sum of its proper divisors (23033026386894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21366437726706 is a wasteful number, since it uses less digits than its factorization.

21366437726706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536225674.

The product of its (nonzero) digits is 64012032, while the sum is 60.

The spelling of 21366437726706 in words is "twenty-one trillion, three hundred sixty-six billion, four hundred thirty-seven million, seven hundred twenty-six thousand, seven hundred six".