21026476 has 18 divisors (see below), whose sum is σ = 37385628. Its totient is φ = 10347480.

The previous prime is 21026443. The next prime is 21026477. The reversal of 21026476 is 67462012.

It is a super-2 number, since 2×21026476² = 884225385957152, which contains 22 as substring.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17371 + ... + 18541.

Almost surely, 2^21026476 is an apocalyptic number.

It is an amenable number.

21026476 is a deficient number, since it is larger than the sum of its proper divisors (16359152).

21026476 is a wasteful number, since it uses less digits than its factorization.

21026476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309 (or 1240 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 21026476 is about 4585.4635534480. The cubic root of 21026476 is about 276.0083138292.

Adding to 21026476 its reverse (67462012), we get a palindrome (88488488).

The spelling of 21026476 in words is "twenty-one million, twenty-six thousand, four hundred seventy-six".