21067404 has 48 divisors (see below), whose sum is σ = 50641920. Its totient is φ = 6814080.

The previous prime is 21067391. The next prime is 21067433. The reversal of 21067404 is 40476012.

It is a super-2 number, since 2×21067404² = 887671022598432, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 67152 + ... + 67464.

It is an arithmetic number, because the mean of its divisors is an integer number (1055040).

Almost surely, 2^21067404 is an apocalyptic number.

It is an amenable number.

21067404 is an abundant number, since it is smaller than the sum of its proper divisors (29574516).

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

21067404 is a wasteful number, since it uses less digits than its factorization.

21067404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 468 counting only the distinct ones).

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

The square root of 21067404 is about 4589.9241823804. The cubic root of 21067404 is about 276.1872809985.

The spelling of 21067404 in words is "twenty-one million, sixty-seven thousand, four hundred four".