21924692 has 6 divisors (see below), whose sum is σ = 38368218. Its totient is φ = 10962344.

The previous prime is 21924653. The next prime is 21924697. The reversal of 21924692 is 29642912.

It can be written as a sum of positive squares in only one way, i.e., 16924996 + 4999696 = 4114^2 + 2236^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21924697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2740583 + ... + 2740590.

It is an arithmetic number, because the mean of its divisors is an integer number (6394703).

Almost surely, 2^21924692 is an apocalyptic number.

It is an amenable number.

21924692 is a deficient number, since it is larger than the sum of its proper divisors (16443526).

21924692 is a wasteful number, since it uses less digits than its factorization.

21924692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5481177 (or 5481175 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 21924692 is about 4682.3810182427. The cubic root of 21924692 is about 279.8838463800.

The spelling of 21924692 in words is "twenty-one million, nine hundred twenty-four thousand, six hundred ninety-two".