21219464 has 16 divisors (see below), whose sum is σ = 45470400. Its totient is φ = 9094032.

The previous prime is 21219449. The next prime is 21219481. The reversal of 21219464 is 46491212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189404 + ... + 189515.

It is an arithmetic number, because the mean of its divisors is an integer number (2841900).

Almost surely, 2^21219464 is an apocalyptic number.

It is an amenable number.

21219464 is an abundant number, since it is smaller than the sum of its proper divisors (24250936).

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

21219464 is a wasteful number, since it uses less digits than its factorization.

21219464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378932 (or 378928 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 21219464 is about 4606.4589437007. The cubic root of 21219464 is about 276.8501755077.

The spelling of 21219464 in words is "twenty-one million, two hundred nineteen thousand, four hundred sixty-four".