21661055161030 has 8 divisors (see below), whose sum is σ = 38989899289872. Its totient is φ = 8664422064408.

The previous prime is 21661055161019. The next prime is 21661055161091. The reversal of 21661055161030 is 3016155016612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1083052758042 + ... + 1083052758061.

It is an arithmetic number, because the mean of its divisors is an integer number (4873737411234).

Almost surely, 2^{21661055161030} is an apocalyptic number.

21661055161030 is a deficient number, since it is larger than the sum of its proper divisors (17328844128842).

21661055161030 is a wasteful number, since it uses less digits than its factorization.

21661055161030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166105516110.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 21661055161030 in words is "twenty-one trillion, six hundred sixty-one billion, fifty-five million, one hundred sixty-one thousand, thirty".