21479454 has 12 divisors (see below), whose sum is σ = 46538856. Its totient is φ = 7159812.

The previous prime is 21479441. The next prime is 21479467. The reversal of 21479454 is 45497412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21479441) and next prime (21479467).

It is a super-2 number, since 2×21479454² = 922733888276232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 596634 + ... + 596669.

It is an arithmetic number, because the mean of its divisors is an integer number (3878238).

Almost surely, 2^21479454 is an apocalyptic number.

21479454 is an abundant number, since it is smaller than the sum of its proper divisors (25059402).

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

21479454 is a wasteful number, since it uses less digits than its factorization.

21479454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193311 (or 1193308 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 21479454 is about 4634.5931860305. The cubic root of 21479454 is about 277.9762845736.

The spelling of 21479454 in words is "twenty-one million, four hundred seventy-nine thousand, four hundred fifty-four".