21233190 has 96 divisors (see below), whose sum is σ = 58351104. Its totient is φ = 4901760.

The previous prime is 21233183. The next prime is 21233197. The reversal of 21233190 is 9133212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21233183) and next prime (21233197).

It is a super-2 number, since 2×21233190² = 901696715152200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233197) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 451747 + ... + 451793.

It is an arithmetic number, because the mean of its divisors is an integer number (607824).

Almost surely, 2^21233190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21233190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29175552).

21233190 is an abundant number, since it is smaller than the sum of its proper divisors (37117914).

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

21233190 is a wasteful number, since it uses less digits than its factorization.

21233190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21233190 is about 4607.9485674213. The cubic root of 21233190 is about 276.9098569781.

The spelling of 21233190 in words is "twenty-one million, two hundred thirty-three thousand, one hundred ninety".