21022260 has 48 divisors (see below), whose sum is σ = 67272576. Its totient is φ = 4804992.

The previous prime is 21022259. The next prime is 21022271. The reversal of 21022260 is 6222012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24607 + ... + 25446.

It is an arithmetic number, because the mean of its divisors is an integer number (1401512).

Almost surely, 2^21022260 is an apocalyptic number.

21022260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022260 is an abundant number, since it is smaller than the sum of its proper divisors (46250316).

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

21022260 is a wasteful number, since it uses less digits than its factorization.

21022260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50072 (or 50070 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21022260 is about 4585.0038167923. The cubic root of 21022260 is about 275.9898652023.

Adding to 21022260 its reverse (6222012), we get a palindrome (27244272).

The spelling of 21022260 in words is "twenty-one million, twenty-two thousand, two hundred sixty".