21617640323274 has 32 divisors (see below), whose sum is σ = 43293751300800. Its totient is φ = 7196141209472.

The previous prime is 21617640323267. The next prime is 21617640323281. The reversal of 21617640323274 is 47232304671612.

It is an interprime number because it is at equal distance from previous prime (21617640323267) and next prime (21617640323281).

It is a super-2 number, since 2×21617640323274² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13176169 + ... + 14725715.

It is an arithmetic number, because the mean of its divisors is an integer number (1352929728150).

Almost surely, 2^{21617640323274} is an apocalyptic number.

21617640323274 is an abundant number, since it is smaller than the sum of its proper divisors (21676110977526).

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

21617640323274 is a wasteful number, since it uses less digits than its factorization.

21617640323274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552694.

The product of its (nonzero) digits is 2032128, while the sum is 48.

Adding to 21617640323274 its reverse (47232304671612), we get a palindrome (68849944994886).

The spelling of 21617640323274 in words is "twenty-one trillion, six hundred seventeen billion, six hundred forty million, three hundred twenty-three thousand, two hundred seventy-four".