21099654 has 24 divisors (see below), whose sum is σ = 47191872. Its totient is φ = 6806160.

The previous prime is 21099649. The next prime is 21099667. The reversal of 21099654 is 45699012.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 18349 + ... + 19464.

It is an arithmetic number, because the mean of its divisors is an integer number (1966328).

Almost surely, 2^21099654 is an apocalyptic number.

21099654 is an abundant number, since it is smaller than the sum of its proper divisors (26092218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21099654 is a wasteful number, since it uses less digits than its factorization.

21099654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37852 (or 37849 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 21099654 is about 4593.4359688582. The cubic root of 21099654 is about 276.3281383897.

The spelling of 21099654 in words is "twenty-one million, ninety-nine thousand, six hundred fifty-four".