21534650 has 24 divisors (see below), whose sum is σ = 40309920. Its totient is φ = 8558960.

The previous prime is 21534577. The next prime is 21534659. The reversal of 21534650 is 5643512.

It is not an unprimeable number, because it can be changed into a prime (21534659) 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 11 ways as a sum of consecutive naturals, for example, 7061 + ... + 9639.

It is an arithmetic number, because the mean of its divisors is an integer number (1679580).

Almost surely, 2^21534650 is an apocalyptic number.

21534650 is a deficient number, since it is larger than the sum of its proper divisors (18775270).

21534650 is a wasteful number, since it uses less digits than its factorization.

21534650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758 (or 2753 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 21534650 is about 4640.5441491273. The cubic root of 21534650 is about 278.2141871947.

The spelling of 21534650 in words is "twenty-one million, five hundred thirty-four thousand, six hundred fifty".