21661190433407 has 32 divisors (see below), whose sum is σ = 26666296664064. Its totient is φ = 17185935888000.

The previous prime is 21661190433403. The next prime is 21661190433409. The reversal of 21661190433407 is 70433409116612.

It is a cyclic number.

It is not a de Polignac number, because 21661190433407 - 2² = 21661190433403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21661190433403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160028657 + ... + 160163957.

It is an arithmetic number, because the mean of its divisors is an integer number (833321770752).

Almost surely, 2^{21661190433407} is an apocalyptic number.

21661190433407 is a deficient number, since it is larger than the sum of its proper divisors (5005106230657).

21661190433407 is a wasteful number, since it uses less digits than its factorization.

21661190433407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167439.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 21661190433407 in words is "twenty-one trillion, six hundred sixty-one billion, one hundred ninety million, four hundred thirty-three thousand, four hundred seven".