21772322 has 32 divisors (see below), whose sum is σ = 38646720. Its totient is φ = 9069120.

The previous prime is 21772313. The next prime is 21772339. The reversal of 21772322 is 22327712.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 21772291 and 21772300.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76793 + ... + 77075.

It is an arithmetic number, because the mean of its divisors is an integer number (1207710).

Almost surely, 2^21772322 is an apocalyptic number.

21772322 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21772322 is a deficient number, since it is larger than the sum of its proper divisors (16874398).

21772322 is a wasteful number, since it uses less digits than its factorization.

21772322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578.

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

The square root of 21772322 is about 4666.0820824328. The cubic root of 21772322 is about 279.2339691102.

The spelling of 21772322 in words is "twenty-one million, seven hundred seventy-two thousand, three hundred twenty-two".