29391021 has 36 divisors (see below), whose sum is σ = 47243196. Its totient is φ = 17592960.

The previous prime is 29390993. The next prime is 29391023. The reversal of 29391021 is 12019392.

It can be written as a sum of positive squares in 2 ways, for example, as 24502500 + 4888521 = 4950^2 + 2211^2 .

It is not a de Polignac number, because 29391021 - 2⁵ = 29390989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29391023) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 149095 + ... + 149291.

It is an arithmetic number, because the mean of its divisors is an integer number (1312311).

Almost surely, 2^29391021 is an apocalyptic number.

It is an amenable number.

29391021 is a deficient number, since it is larger than the sum of its proper divisors (17852175).

29391021 is a wasteful number, since it uses less digits than its factorization.

29391021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 29391021 is about 5421.3486329510. The cubic root of 29391021 is about 308.6063734491.

The spelling of 29391021 in words is "twenty-nine million, three hundred ninety-one thousand, twenty-one".