21629130 has 16 divisors (see below), whose sum is σ = 51909984. Its totient is φ = 5767760.

The previous prime is 21629123. The next prime is 21629137. The reversal of 21629130 is 3192612.

It is an interprime number because it is at equal distance from previous prime (21629123) and next prime (21629137).

It is a self number, because there is not a number n which added to its sum of digits gives 21629130.

It is not an unprimeable number, because it can be changed into a prime (21629137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360456 + ... + 360515.

It is an arithmetic number, because the mean of its divisors is an integer number (3244374).

Almost surely, 2^21629130 is an apocalyptic number.

21629130 is an abundant number, since it is smaller than the sum of its proper divisors (30280854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21629130 is a wasteful number, since it uses less digits than its factorization.

21629130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720981.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 21629130 is about 4650.7128485857. The cubic root of 21629130 is about 278.6204677451.

The spelling of 21629130 in words is "twenty-one million, six hundred twenty-nine thousand, one hundred thirty".