21502149 has 8 divisors (see below), whose sum is σ = 28814400. Its totient is φ = 14262336.

The previous prime is 21502123. The next prime is 21502157. The reversal of 21502149 is 94120512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21502149 - 2¹³ = 21493957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21502199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17412 + ... + 18605.

It is an arithmetic number, because the mean of its divisors is an integer number (3601800).

Almost surely, 2^21502149 is an apocalyptic number.

It is an amenable number.

21502149 is a deficient number, since it is larger than the sum of its proper divisors (7312251).

21502149 is a wasteful number, since it uses less digits than its factorization.

21502149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36219.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 21502149 is about 4637.0409745871. The cubic root of 21502149 is about 278.0741525359.

The spelling of 21502149 in words is "twenty-one million, five hundred two thousand, one hundred forty-nine".