21267772 has 24 divisors (see below), whose sum is σ = 38247552. Its totient is φ = 10344000.

The previous prime is 21267769. The next prime is 21267773. The reversal of 21267772 is 27776212.

Its product of digits (16464) is a multiple of the sum of its prime factors (1029).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21267773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24213 + ... + 25075.

It is an arithmetic number, because the mean of its divisors is an integer number (1593648).

Almost surely, 2^21267772 is an apocalyptic number.

It is an amenable number.

21267772 is a deficient number, since it is larger than the sum of its proper divisors (16979780).

21267772 is a wasteful number, since it uses less digits than its factorization.

21267772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029 (or 1027 counting only the distinct ones).

The product of its digits is 16464, while the sum is 34.

The square root of 21267772 is about 4611.6994698267. The cubic root of 21267772 is about 277.0601076405.

The spelling of 21267772 in words is "twenty-one million, two hundred sixty-seven thousand, seven hundred seventy-two".