21302292 has 72 divisors (see below), whose sum is σ = 57915648. Its totient is φ = 6068480.

The previous prime is 21302291. The next prime is 21302293. The reversal of 21302292 is 29220312.

It is an interprime number because it is at equal distance from previous prime (21302291) and next prime (21302293).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24253 + ... + 25115.

It is an arithmetic number, because the mean of its divisors is an integer number (804384).

Almost surely, 2^21302292 is an apocalyptic number.

21302292 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21302292, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28957824).

21302292 is an abundant number, since it is smaller than the sum of its proper divisors (36613356).

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

21302292 is a wasteful number, since it uses less digits than its factorization.

21302292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909 (or 896 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21302292 is about 4615.4406073527. The cubic root of 21302292 is about 277.2099265783.

The spelling of 21302292 in words is "twenty-one million, three hundred two thousand, two hundred ninety-two".