21036629 has 16 divisors (see below), whose sum is σ = 23265600. Its totient is φ = 18942336.

The previous prime is 21036623. The next prime is 21036637. The reversal of 21036629 is 92663012.

It is not a de Polignac number, because 21036629 - 2¹² = 21032533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39962 + ... + 40484.

It is an arithmetic number, because the mean of its divisors is an integer number (1454100).

Almost surely, 2^21036629 is an apocalyptic number.

21036629 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21036629 is a deficient number, since it is larger than the sum of its proper divisors (2228971).

21036629 is a wasteful number, since it uses less digits than its factorization.

21036629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 21036629 is about 4586.5705052904. The cubic root of 21036629 is about 276.0527318205.

The spelling of 21036629 in words is "twenty-one million, thirty-six thousand, six hundred twenty-nine".