21221092 has 6 divisors (see below), whose sum is σ = 37136918. Its totient is φ = 10610544.

The previous prime is 21221077. The next prime is 21221099. The reversal of 21221092 is 29012212.

It can be written as a sum of positive squares in only one way, i.e., 19838116 + 1382976 = 4454^2 + 1176^2 .

It is not an unprimeable number, because it can be changed into a prime (21221099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652633 + ... + 2652640.

Almost surely, 2^21221092 is an apocalyptic number.

It is an amenable number.

21221092 is a deficient number, since it is larger than the sum of its proper divisors (15915826).

21221092 is a wasteful number, since it uses less digits than its factorization.

21221092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305277 (or 5305275 counting only the distinct ones).

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

The square root of 21221092 is about 4606.6356487137. The cubic root of 21221092 is about 276.8572554943.

The spelling of 21221092 in words is "twenty-one million, two hundred twenty-one thousand, ninety-two".