21772300 has 36 divisors (see below), whose sum is σ = 51543576. Its totient is φ = 7916800.

The previous prime is 21772259. The next prime is 21772313. The reversal of 21772300 is 327712.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8797 + ... + 10996.

It is an arithmetic number, because the mean of its divisors is an integer number (1431766).

Almost surely, 2^21772300 is an apocalyptic number.

21772300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21772300 is an abundant number, since it is smaller than the sum of its proper divisors (29771276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21772300 is a wasteful number, since it uses less digits than its factorization.

21772300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19818 (or 19811 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 21772300 is about 4666.0797249940. The cubic root of 21772300 is about 279.2338750588.

The spelling of 21772300 in words is "twenty-one million, seven hundred seventy-two thousand, three hundred".