21422004 has 24 divisors (see below), whose sum is σ = 50268960. Its totient is φ = 7100064.

The previous prime is 21421997. The next prime is 21422021. The reversal of 21422004 is 40022412.

21422004 = T₃₉₇ + T₃₉₈ + ... + T₅₇₅.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2839 + ... + 7134.

It is an arithmetic number, because the mean of its divisors is an integer number (2094540).

Almost surely, 2^21422004 is an apocalyptic number.

It is an amenable number.

21422004 is an abundant number, since it is smaller than the sum of its proper divisors (28846956).

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

21422004 is a wasteful number, since it uses less digits than its factorization.

21422004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10159 (or 10157 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 21422004 is about 4628.3910811426. The cubic root of 21422004 is about 277.7282336291.

Adding to 21422004 its reverse (40022412), we get a palindrome (61444416).

The spelling of 21422004 in words is "twenty-one million, four hundred twenty-two thousand, four".