21652641 has 12 divisors (see below), whose sum is σ = 31344768. Its totient is φ = 14403384.

The previous prime is 21652639. The next prime is 21652643. The reversal of 21652641 is 14625612.

21652641 is a `hidden beast` number, since 2 + 1 + 652 + 6 + 4 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21652639) and next prime (21652643).

It is not a de Polignac number, because 21652641 - 2¹ = 21652639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21652643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2136 + ... + 6918.

It is an arithmetic number, because the mean of its divisors is an integer number (2612064).

Almost surely, 2^21652641 is an apocalyptic number.

It is an amenable number.

21652641 is a deficient number, since it is larger than the sum of its proper divisors (9692127).

21652641 is a wasteful number, since it uses less digits than its factorization.

21652641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5292 (or 5289 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 21652641 is about 4653.2398390799. The cubic root of 21652641 is about 278.7213852533.

The spelling of 21652641 in words is "twenty-one million, six hundred fifty-two thousand, six hundred forty-one".