21727494 has 16 divisors (see below), whose sum is σ = 48283440. Its totient is φ = 7242480.

The previous prime is 21727493. The next prime is 21727543. The reversal of 21727494 is 49472712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21727493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201127 + ... + 201234.

It is an arithmetic number, because the mean of its divisors is an integer number (3017715).

Almost surely, 2^21727494 is an apocalyptic number.

21727494 is an abundant number, since it is smaller than the sum of its proper divisors (26555946).

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

21727494 is a wasteful number, since it uses less digits than its factorization.

21727494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402372 (or 402366 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 21727494 is about 4661.2760055590. The cubic root of 21727494 is about 279.0421950288.

The spelling of 21727494 in words is "twenty-one million, seven hundred twenty-seven thousand, four hundred ninety-four".