21273332 has 6 divisors (see below), whose sum is σ = 37228338. Its totient is φ = 10636664.

The previous prime is 21273319. The next prime is 21273349. The reversal of 21273332 is 23337212.

It can be written as a sum of positive squares in only one way, i.e., 19412836 + 1860496 = 4406^2 + 1364^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21273298 and 21273307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2659163 + ... + 2659170.

It is an arithmetic number, because the mean of its divisors is an integer number (6204723).

Almost surely, 2^21273332 is an apocalyptic number.

It is an amenable number.

21273332 is a deficient number, since it is larger than the sum of its proper divisors (15955006).

21273332 is a wasteful number, since it uses less digits than its factorization.

21273332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318337 (or 5318335 counting only the distinct ones).

The product of its digits is 1512, while the sum is 23.

The square root of 21273332 is about 4612.3022450833. The cubic root of 21273332 is about 277.0842493321.

The spelling of 21273332 in words is "twenty-one million, two hundred seventy-three thousand, three hundred thirty-two".