21301629 has 16 divisors (see below), whose sum is σ = 30223872. Its totient is φ = 13298688.

The previous prime is 21301613. The next prime is 21301691. The reversal of 21301629 is 92610312.

It is not a de Polignac number, because 21301629 - 2⁴ = 21301613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21301599 and 21301608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301229) 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, 10437 + ... + 12309.

It is an arithmetic number, because the mean of its divisors is an integer number (1888992).

Almost surely, 2^21301629 is an apocalyptic number.

It is an amenable number.

21301629 is a deficient number, since it is larger than the sum of its proper divisors (8922243).

21301629 is a wasteful number, since it uses less digits than its factorization.

21301629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116.

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

The square root of 21301629 is about 4615.3687826652. The cubic root of 21301629 is about 277.2070506422.

The spelling of 21301629 in words is "twenty-one million, three hundred one thousand, six hundred twenty-nine".