21869029 has 8 divisors (see below), whose sum is σ = 26915840. Its totient is φ = 17302896.

The previous prime is 21869027. The next prime is 21869033. The reversal of 21869029 is 92096812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21869029 - 2¹ = 21869027 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21869027) 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, 120069 + ... + 120250.

It is an arithmetic number, because the mean of its divisors is an integer number (3364480).

Almost surely, 2^21869029 is an apocalyptic number.

It is an amenable number.

21869029 is a deficient number, since it is larger than the sum of its proper divisors (5046811).

21869029 is a wasteful number, since it uses less digits than its factorization.

21869029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240339.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 21869029 is about 4676.4333631519. The cubic root of 21869029 is about 279.6467867602.

The spelling of 21869029 in words is "twenty-one million, eight hundred sixty-nine thousand, twenty-nine".