29229279900921 has 9 divisors (see below), whose sum is σ = 42220094395791. Its totient is φ = 19486175787792.

The previous prime is 29229279900889. The next prime is 29229279900983. The reversal of 29229279900921 is 12900997292292.

The square root of 29229279900921 is 5406411.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 28634431743225 + 594848157696 = 5351115^2 + 771264^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 29229279900921 - 2⁵ = 29229279900889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (29229279900421) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15318165 + ... + 17120301.

Almost surely, 2^{29229279900921} is an apocalyptic number.

29229279900921 is the 5406411-st square number.

29229279900921 is the 2703206-th centered octagonal number.

It is an amenable number.

29229279900921 is a deficient number, since it is larger than the sum of its proper divisors (12990814494870).

29229279900921 is an frugal number, since it uses more digits than its factorization.

29229279900921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3604280 (or 1802140 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 63.

The spelling of 29229279900921 in words is "twenty-nine trillion, two hundred twenty-nine billion, two hundred seventy-nine million, nine hundred thousand, nine hundred twenty-one".