21621301005670 has 16 divisors (see below), whose sum is σ = 39556347414768. Its totient is φ = 8506741379040.

The previous prime is 21621301005593. The next prime is 21621301005673. The reversal of 21621301005670 is 7650010312612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621301005673) 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, 17722377264 + ... + 17722378483.

It is an arithmetic number, because the mean of its divisors is an integer number (2472271713423).

Almost surely, 2^{21621301005670} is an apocalyptic number.

21621301005670 is a deficient number, since it is larger than the sum of its proper divisors (17935046409098).

21621301005670 is a wasteful number, since it uses less digits than its factorization.

21621301005670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35444755815.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21621301005670 in words is "twenty-one trillion, six hundred twenty-one billion, three hundred one million, five thousand, six hundred seventy".