21632654 has 4 divisors (see below), whose sum is σ = 32448984. Its totient is φ = 10816326.

The previous prime is 21632651. The next prime is 21632657. The reversal of 21632654 is 45623612.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21632651) and next prime (21632657).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21632651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5408162 + ... + 5408165.

It is an arithmetic number, because the mean of its divisors is an integer number (8112246).

Almost surely, 2^21632654 is an apocalyptic number.

21632654 is a deficient number, since it is larger than the sum of its proper divisors (10816330).

21632654 is a wasteful number, since it uses less digits than its factorization.

21632654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10816329.

The product of its digits is 8640, while the sum is 29.

The square root of 21632654 is about 4651.0916998055. The cubic root of 21632654 is about 278.6355986543.

The spelling of 21632654 in words is "twenty-one million, six hundred thirty-two thousand, six hundred fifty-four".