21377222 has 4 divisors (see below), whose sum is σ = 32065836. Its totient is φ = 10688610.

The previous prime is 21377201. The next prime is 21377233. The reversal of 21377222 is 22277312.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21377191 and 21377200.

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, 5344304 + ... + 5344307.

It is an arithmetic number, because the mean of its divisors is an integer number (8016459).

Almost surely, 2^21377222 is an apocalyptic number.

21377222 is a deficient number, since it is larger than the sum of its proper divisors (10688614).

21377222 is a wasteful number, since it uses less digits than its factorization.

21377222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10688613.

The product of its digits is 2352, while the sum is 26.

The square root of 21377222 is about 4623.5507999805. The cubic root of 21377222 is about 277.5345713496.

The spelling of 21377222 in words is "twenty-one million, three hundred seventy-seven thousand, two hundred twenty-two".