29221450821 has 6 divisors (see below), whose sum is σ = 42208762310. Its totient is φ = 19480967208.

The previous prime is 29221450813. The next prime is 29221450823. The reversal of 29221450821 is 12805412292.

It can be written as a sum of positive squares in only one way, i.e., 17079614721 + 12141836100 = 130689^2 + 110190^2 .

It is not a de Polignac number, because 29221450821 - 2³ = 29221450813 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 (29221450823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1623413926 + ... + 1623413943.

Almost surely, 2^29221450821 is an apocalyptic number.

It is an amenable number.

29221450821 is a deficient number, since it is larger than the sum of its proper divisors (12987311489).

29221450821 is a wasteful number, since it uses less digits than its factorization.

29221450821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246827875 (or 3246827872 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 29221450821 in words is "twenty-nine billion, two hundred twenty-one million, four hundred fifty thousand, eight hundred twenty-one".