21650654 has 4 divisors (see below), whose sum is σ = 32475984. Its totient is φ = 10825326.

The previous prime is 21650653. The next prime is 21650683. The reversal of 21650654 is 45605612.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5412662 + ... + 5412665.

It is an arithmetic number, because the mean of its divisors is an integer number (8118996).

Almost surely, 2^21650654 is an apocalyptic number.

21650654 is a deficient number, since it is larger than the sum of its proper divisors (10825330).

21650654 is a wasteful number, since it uses less digits than its factorization.

21650654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10825329.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 21650654 is about 4653.0263270263. The cubic root of 21650654 is about 278.7128591751.

The spelling of 21650654 in words is "twenty-one million, six hundred fifty thousand, six hundred fifty-four".