21090409734676 has 12 divisors (see below), whose sum is σ = 36913150682100. Its totient is φ = 10543795254080.

The previous prime is 21090409734673. The next prime is 21090409734679. The reversal of 21090409734676 is 67643790409012.

It is an interprime number because it is at equal distance from previous prime (21090409734673) and next prime (21090409734679).

It can be written as a sum of positive squares in 2 ways, for example, as 15379934819076 + 5710474915600 = 3921726^2 + 2389660^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21090409734676.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21090409734673) 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, 352369651 + ... + 352429498.

It is an arithmetic number, because the mean of its divisors is an integer number (3076095890175).

Almost surely, 2^{21090409734676} is an apocalyptic number.

It is an amenable number.

21090409734676 is a deficient number, since it is larger than the sum of its proper divisors (15822740947424).

21090409734676 is a wasteful number, since it uses less digits than its factorization.

21090409734676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704806634 (or 704806632 counting only the distinct ones).

The product of its (nonzero) digits is 13716864, while the sum is 58.

The spelling of 21090409734676 in words is "twenty-one trillion, ninety billion, four hundred nine million, seven hundred thirty-four thousand, six hundred seventy-six".