21029799 has 16 divisors (see below), whose sum is σ = 33931008. Its totient is φ = 11309952.

The previous prime is 21029791. The next prime is 21029831. The reversal of 21029799 is 99792012.

It is a happy number.

It is not a de Polignac number, because 21029799 - 2³ = 21029791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21029791) 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, 29097 + ... + 29810.

It is an arithmetic number, because the mean of its divisors is an integer number (2120688).

Almost surely, 2^21029799 is an apocalyptic number.

21029799 is a deficient number, since it is larger than the sum of its proper divisors (12901209).

21029799 is a wasteful number, since it uses less digits than its factorization.

21029799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58934.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 21029799 is about 4585.8258798171. The cubic root of 21029799 is about 276.0228530751.

The spelling of 21029799 in words is "twenty-one million, twenty-nine thousand, seven hundred ninety-nine".