21869094 has 16 divisors (see below), whose sum is σ = 47102832. Its totient is φ = 6728928.

The previous prime is 21869093. The next prime is 21869101. The reversal of 21869094 is 49096812.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21869093) 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, 140109 + ... + 140264.

It is an arithmetic number, because the mean of its divisors is an integer number (2943927).

Almost surely, 2^21869094 is an apocalyptic number.

21869094 is an abundant number, since it is smaller than the sum of its proper divisors (25233738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21869094 is a wasteful number, since it uses less digits than its factorization.

21869094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280391.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 21869094 is about 4676.4403128876. The cubic root of 21869094 is about 279.6470638191.

The spelling of 21869094 in words is "twenty-one million, eight hundred sixty-nine thousand, ninety-four".