21959961596690 has 32 divisors (see below), whose sum is σ = 42569489750256. Its totient is φ = 8108112787200.

The previous prime is 21959961596689. The next prime is 21959961596707. The reversal of 21959961596690 is 9669516995912.

It can be written as a sum of positive squares in 8 ways, for example, as 893174316241 + 21066787280449 = 945079^2 + 4589857^2 .

It is a super-2 number, since 2×21959961596690² (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, 4043840 + ... + 7763540.

Almost surely, 2^{21959961596690} is an apocalyptic number.

21959961596690 is a deficient number, since it is larger than the sum of its proper divisors (20609528153566).

21959961596690 is a wasteful number, since it uses less digits than its factorization.

21959961596690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3765134.

The product of its (nonzero) digits is 637729200, while the sum is 77.

The spelling of 21959961596690 in words is "twenty-one trillion, nine hundred fifty-nine billion, nine hundred sixty-one million, five hundred ninety-six thousand, six hundred ninety".