21026472 has 16 divisors (see below), whose sum is σ = 52566240. Its totient is φ = 7008816.

The previous prime is 21026443. The next prime is 21026477. The reversal of 21026472 is 27462012.

It is a super-2 number, since 2×21026472² = 884225049533568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 876103 = 21026472 / (2 + 1 + 0 + 2 + 6 + 4 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (21026477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438028 + ... + 438075.

It is an arithmetic number, because the mean of its divisors is an integer number (3285390).

Almost surely, 2^21026472 is an apocalyptic number.

It is an amenable number.

21026472 is an abundant number, since it is smaller than the sum of its proper divisors (31539768).

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

21026472 is a wasteful number, since it uses less digits than its factorization.

21026472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876112 (or 876108 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21026472 is about 4585.4631172871. The cubic root of 21026472 is about 276.0082963270.

Adding to 21026472 its reverse (27462012), we get a palindrome (48488484).

The spelling of 21026472 in words is "twenty-one million, twenty-six thousand, four hundred seventy-two".