21070629 has 24 divisors (see below), whose sum is σ = 31336032. Its totient is φ = 13638240.

The previous prime is 21070613. The next prime is 21070657. The reversal of 21070629 is 92607012.

It is not a de Polignac number, because 21070629 - 2⁴ = 21070613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21072629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49839 + ... + 50259.

It is an arithmetic number, because the mean of its divisors is an integer number (1305668).

Almost surely, 2^21070629 is an apocalyptic number.

It is an amenable number.

21070629 is a deficient number, since it is larger than the sum of its proper divisors (10265403).

21070629 is a wasteful number, since it uses less digits than its factorization.

21070629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21070629 is about 4590.2754819292. The cubic root of 21070629 is about 276.2013732036.

The spelling of 21070629 in words is "twenty-one million, seventy thousand, six hundred twenty-nine".