21611317320442 has 16 divisors (see below), whose sum is σ = 35122086153792. Its totient is φ = 9933519314880.

The previous prime is 21611317320421. The next prime is 21611317320443. The reversal of 21611317320442 is 24402371311612.

It is a super-2 number, since 2×21611317320442² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21611317320443) 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, 7391009934 + ... + 7391012857.

It is an arithmetic number, because the mean of its divisors is an integer number (2195130384612).

Almost surely, 2^{21611317320442} is an apocalyptic number.

21611317320442 is a deficient number, since it is larger than the sum of its proper divisors (13510768833350).

21611317320442 is a wasteful number, since it uses less digits than its factorization.

21611317320442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14782022853.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 21611317320442 in words is "twenty-one trillion, six hundred eleven billion, three hundred seventeen million, three hundred twenty thousand, four hundred forty-two".