29490021 has 32 divisors (see below), whose sum is σ = 49213440. Its totient is φ = 17290800.

The previous prime is 29490007. The next prime is 29490031. The reversal of 29490021 is 12009492.

It is not a de Polignac number, because 29490021 - 2¹⁹ = 28965733 is a prime.

It is a super-2 number, since 2×29490021² = 1739322677160882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29490031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7606 + ... + 10808.

It is an arithmetic number, because the mean of its divisors is an integer number (1537920).

Almost surely, 2^29490021 is an apocalyptic number.

It is an amenable number.

29490021 is a deficient number, since it is larger than the sum of its proper divisors (19723419).

29490021 is a wasteful number, since it uses less digits than its factorization.

29490021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254 (or 3248 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 29490021 is about 5430.4715264883. The cubic root of 29490021 is about 308.9524858604.

The spelling of 29490021 in words is "twenty-nine million, four hundred ninety thousand, twenty-one".