21741492 has 12 divisors (see below), whose sum is σ = 50730176. Its totient is φ = 7247160.

The previous prime is 21741481. The next prime is 21741493. The reversal of 21741492 is 29414712.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21741493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 905884 + ... + 905907.

Almost surely, 2^21741492 is an apocalyptic number.

It is an amenable number.

21741492 is an abundant number, since it is smaller than the sum of its proper divisors (28988684).

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

21741492 is a wasteful number, since it uses less digits than its factorization.

21741492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811798 (or 1811796 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 21741492 is about 4662.7772839800. Note that the first 3 decimals coincide. The cubic root of 21741492 is about 279.1021067413.

The spelling of 21741492 in words is "twenty-one million, seven hundred forty-one thousand, four hundred ninety-two".