21763492 has 6 divisors (see below), whose sum is σ = 38086118. Its totient is φ = 10881744.

The previous prime is 21763481. The next prime is 21763499. The reversal of 21763492 is 29436712.

It can be written as a sum of positive squares in only one way, i.e., 14930496 + 6832996 = 3864^2 + 2614^2 .

It is not an unprimeable number, because it can be changed into a prime (21763499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2720433 + ... + 2720440.

Almost surely, 2^21763492 is an apocalyptic number.

It is an amenable number.

21763492 is a deficient number, since it is larger than the sum of its proper divisors (16322626).

21763492 is a wasteful number, since it uses less digits than its factorization.

21763492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5440877 (or 5440875 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 21763492 is about 4665.1357965230. The cubic root of 21763492 is about 279.1962152233.

The spelling of 21763492 in words is "twenty-one million, seven hundred sixty-three thousand, four hundred ninety-two".