29122021 has 4 divisors (see below), whose sum is σ = 29379852. Its totient is φ = 28864192.

The previous prime is 29121977. The next prime is 29122031. The reversal of 29122021 is 12022192.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14145121 + 14976900 = 3761^2 + 3870^2 .

It is a cyclic number.

It is not a de Polignac number, because 29122021 - 2⁷ = 29121893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 29122021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29122031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128746 + ... + 128971.

It is an arithmetic number, because the mean of its divisors is an integer number (7344963).

Almost surely, 2^29122021 is an apocalyptic number.

It is an amenable number.

29122021 is a deficient number, since it is larger than the sum of its proper divisors (257831).

29122021 is a wasteful number, since it uses less digits than its factorization.

29122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257830.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 29122021 is about 5396.4822801525. The cubic root of 29122021 is about 307.6619844108.

The spelling of 29122021 in words is "twenty-nine million, one hundred twenty-two thousand, twenty-one".