21386292 has 24 divisors (see below), whose sum is σ = 50297856. Its totient is φ = 7072128.

The previous prime is 21386291. The next prime is 21386293. The reversal of 21386292 is 29268312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21386291) and next prime (21386293).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21386291) 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, 5493 + ... + 8540.

It is an arithmetic number, because the mean of its divisors is an integer number (2095744).

Almost surely, 2^21386292 is an apocalyptic number.

It is an amenable number.

21386292 is an abundant number, since it is smaller than the sum of its proper divisors (28911564).

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

21386292 is a wasteful number, since it uses less digits than its factorization.

21386292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14167 (or 14165 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 21386292 is about 4624.5315438431. The cubic root of 21386292 is about 277.5738169017.

The spelling of 21386292 in words is "twenty-one million, three hundred eighty-six thousand, two hundred ninety-two".