21541368 has 16 divisors (see below), whose sum is σ = 53853480. Its totient is φ = 7180448.

The previous prime is 21541361. The next prime is 21541379. The reversal of 21541368 is 86314512.

It is a super-2 number, since 2×21541368² = 928061070622848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448755 + ... + 448802.

Almost surely, 2^21541368 is an apocalyptic number.

It is an amenable number.

21541368 is an abundant number, since it is smaller than the sum of its proper divisors (32312112).

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

21541368 is a wasteful number, since it uses less digits than its factorization.

21541368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897566 (or 897562 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 21541368 is about 4641.2679302105. The cubic root of 21541368 is about 278.2431149706.

The spelling of 21541368 in words is "twenty-one million, five hundred forty-one thousand, three hundred sixty-eight".