21970292 has 6 divisors (see below), whose sum is σ = 38448018. Its totient is φ = 10985144.

The previous prime is 21970271. The next prime is 21970297. The reversal of 21970292 is 29207912.

It can be written as a sum of positive squares in only one way, i.e., 19678096 + 2292196 = 4436^2 + 1514^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21970297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2746283 + ... + 2746290.

It is an arithmetic number, because the mean of its divisors is an integer number (6408003).

Almost surely, 2^21970292 is an apocalyptic number.

It is an amenable number.

21970292 is a deficient number, since it is larger than the sum of its proper divisors (16477726).

21970292 is a wasteful number, since it uses less digits than its factorization.

21970292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5492577 (or 5492575 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 21970292 is about 4687.2478065492. The cubic root of 21970292 is about 280.0777505170.

The spelling of 21970292 in words is "twenty-one million, nine hundred seventy thousand, two hundred ninety-two".