21464541 has 24 divisors (see below), whose sum is σ = 36450240. Its totient is φ = 12229056.

The previous prime is 21464539. The next prime is 21464549. The reversal of 21464541 is 14546412.

21464541 is a `hidden beast` number, since 2 + 14 + 645 + 4 + 1 = 666.

It is not a de Polignac number, because 21464541 - 2¹ = 21464539 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21464549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63525 + ... + 63861.

It is an arithmetic number, because the mean of its divisors is an integer number (1518760).

Almost surely, 2^21464541 is an apocalyptic number.

21464541 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21464541 is a deficient number, since it is larger than the sum of its proper divisors (14985699).

21464541 is an frugal number, since it uses more digits than its factorization.

21464541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690 (or 347 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21464541 is about 4632.9840276004. The cubic root of 21464541 is about 277.9119374990.

The spelling of 21464541 in words is "twenty-one million, four hundred sixty-four thousand, five hundred forty-one".