21467420 has 24 divisors (see below), whose sum is σ = 48549984. Its totient is φ = 7926336.

The previous prime is 21467419. The next prime is 21467429. The reversal of 21467420 is 2476412.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 21467420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21467429) 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 7 ways as a sum of consecutive naturals, for example, 41024 + ... + 41543.

It is an arithmetic number, because the mean of its divisors is an integer number (2022916).

Almost surely, 2^21467420 is an apocalyptic number.

21467420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21467420 is an abundant number, since it is smaller than the sum of its proper divisors (27082564).

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

21467420 is a wasteful number, since it uses less digits than its factorization.

21467420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82589 (or 82587 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 21467420 is about 4633.2947240598. The cubic root of 21467420 is about 277.9243622184.

The spelling of 21467420 in words is "twenty-one million, four hundred sixty-seven thousand, four hundred twenty".