21011492 has 12 divisors (see below), whose sum is σ = 38705520. Its totient is φ = 9952776.

The previous prime is 21011453. The next prime is 21011503. The reversal of 21011492 is 29411012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138158 + ... + 138309.

It is an arithmetic number, because the mean of its divisors is an integer number (3225460).

Almost surely, 2^21011492 is an apocalyptic number.

It is an amenable number.

21011492 is a deficient number, since it is larger than the sum of its proper divisors (17694028).

21011492 is a wasteful number, since it uses less digits than its factorization.

21011492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276490 (or 276488 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 21011492 is about 4583.8294034573. The cubic root of 21011492 is about 275.9427347411.

The spelling of 21011492 in words is "twenty-one million, eleven thousand, four hundred ninety-two".