29990121 has 16 divisors (see below), whose sum is σ = 45779328. Its totient is φ = 17107200.

The previous prime is 29990119. The next prime is 29990123. The reversal of 29990121 is 12109992.

It is an interprime number because it is at equal distance from previous prime (29990119) and next prime (29990123).

It is not a de Polignac number, because 29990121 - 2¹ = 29990119 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (29990123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17691 + ... + 19311.

It is an arithmetic number, because the mean of its divisors is an integer number (2861208).

Almost surely, 2^29990121 is an apocalyptic number.

29990121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

29990121 is a deficient number, since it is larger than the sum of its proper divisors (15789207).

29990121 is a wasteful number, since it uses less digits than its factorization.

29990121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 29990121 is about 5476.3236756057. The cubic root of 29990121 is about 310.6891397954.

The spelling of 29990121 in words is "twenty-nine million, nine hundred ninety thousand, one hundred twenty-one".