21741372 has 30 divisors (see below), whose sum is σ = 56837088. Its totient is φ = 7247016.

The previous prime is 21741367. The next prime is 21741373. The reversal of 21741372 is 27314712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21741373) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 33228 + ... + 33875.

Almost surely, 2^21741372 is an apocalyptic number.

It is an amenable number.

21741372 is an abundant number, since it is smaller than the sum of its proper divisors (35095716).

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

21741372 is a wasteful number, since it uses less digits than its factorization.

21741372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67119 (or 67108 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 21741372 is about 4662.7644160948. The cubic root of 21741372 is about 279.1015932483.

The spelling of 21741372 in words is "twenty-one million, seven hundred forty-one thousand, three hundred seventy-two".