21949412 has 6 divisors (see below), whose sum is σ = 38411478. Its totient is φ = 10974704.

The previous prime is 21949409. The next prime is 21949453. The reversal of 21949412 is 21494912.

It can be written as a sum of positive squares in only one way, i.e., 17522596 + 4426816 = 4186^2 + 2104^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2743673 + ... + 2743680.

It is an arithmetic number, because the mean of its divisors is an integer number (6401913).

Almost surely, 2^21949412 is an apocalyptic number.

It is an amenable number.

21949412 is a deficient number, since it is larger than the sum of its proper divisors (16462066).

21949412 is a wasteful number, since it uses less digits than its factorization.

21949412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5487357 (or 5487355 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 21949412 is about 4685.0199572681. The cubic root of 21949412 is about 279.9889961662.

The spelling of 21949412 in words is "twenty-one million, nine hundred forty-nine thousand, four hundred twelve".