21120292 has 6 divisors (see below), whose sum is σ = 36960518. Its totient is φ = 10560144.

The previous prime is 21120283. The next prime is 21120311. The reversal of 21120292 is 29202112.

It can be written as a sum of positive squares in only one way, i.e., 18113536 + 3006756 = 4256^2 + 1734^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2640033 + ... + 2640040.

Almost surely, 2^21120292 is an apocalyptic number.

It is an amenable number.

21120292 is a deficient number, since it is larger than the sum of its proper divisors (15840226).

21120292 is a wasteful number, since it uses less digits than its factorization.

21120292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280077 (or 5280075 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21120292 is about 4595.6818862928. The cubic root of 21120292 is about 276.4182030857.

It can be divided in two parts, 21120 and 292, that added together give a palindrome (21412).

The spelling of 21120292 in words is "twenty-one million, one hundred twenty thousand, two hundred ninety-two".