21152737926321 has 16 divisors (see below), whose sum is σ = 28629514569984. Its totient is φ = 13888965548304.

The previous prime is 21152737926317. The next prime is 21152737926329. The reversal of 21152737926321 is 12362973725112.

It is not a de Polignac number, because 21152737926321 - 2² = 21152737926317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21152737926329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7858935 + ... + 10201388.

It is an arithmetic number, because the mean of its divisors is an integer number (1789344660624).

Almost surely, 2^{21152737926321} is an apocalyptic number.

It is an amenable number.

21152737926321 is a deficient number, since it is larger than the sum of its proper divisors (7476776643663).

21152737926321 is a wasteful number, since it uses less digits than its factorization.

21152737926321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18066220.

The product of its digits is 1905120, while the sum is 51.

The spelling of 21152737926321 in words is "twenty-one trillion, one hundred fifty-two billion, seven hundred thirty-seven million, nine hundred twenty-six thousand, three hundred twenty-one".