21219954 has 16 divisors (see below), whose sum is σ = 48502848. Its totient is φ = 6062832.

The previous prime is 21219949. The next prime is 21219977. The reversal of 21219954 is 45991212.

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, 252577 + ... + 252660.

It is an arithmetic number, because the mean of its divisors is an integer number (3031428).

Almost surely, 2^21219954 is an apocalyptic number.

21219954 is an abundant number, since it is smaller than the sum of its proper divisors (27282894).

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

21219954 is a wasteful number, since it uses less digits than its factorization.

21219954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505249.

The product of its digits is 6480, while the sum is 33.

The square root of 21219954 is about 4606.5121295835. The cubic root of 21219954 is about 276.8523065000.

The spelling of 21219954 in words is "twenty-one million, two hundred nineteen thousand, nine hundred fifty-four".