21411672 has 16 divisors (see below), whose sum is σ = 53529240. Its totient is φ = 7137216.

The previous prime is 21411667. The next prime is 21411679. The reversal of 21411672 is 27611412.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 892153 = 21411672 / (2 + 1 + 4 + 1 + 1 + 6 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446053 + ... + 446100.

Almost surely, 2^21411672 is an apocalyptic number.

It is an amenable number.

21411672 is an abundant number, since it is smaller than the sum of its proper divisors (32117568).

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

21411672 is a wasteful number, since it uses less digits than its factorization.

21411672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892162 (or 892158 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

The square root of 21411672 is about 4627.2747919267. The cubic root of 21411672 is about 277.6835762827.

The spelling of 21411672 in words is "twenty-one million, four hundred eleven thousand, six hundred seventy-two".