21038292 has 60 divisors (see below), whose sum is σ = 60008256. Its totient is φ = 6374160.

The previous prime is 21038291. The next prime is 21038293. The reversal of 21038292 is 29283012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21038291) and next prime (21038293).

It is a super-4 number, since 4×21038292⁴ (a number of 30 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038291) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 613 + ... + 6515.

Almost surely, 2^21038292 is an apocalyptic number.

21038292 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 21038292, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30004128).

21038292 is an abundant number, since it is smaller than the sum of its proper divisors (38969964).

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

21038292 is a wasteful number, since it uses less digits than its factorization.

21038292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5930 (or 5919 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21038292 is about 4586.7517918457. The cubic root of 21038292 is about 276.0600058566.

The spelling of 21038292 in words is "twenty-one million, thirty-eight thousand, two hundred ninety-two".