21191502 has 16 divisors (see below), whose sum is σ = 43102080. Its totient is φ = 6943992.

The previous prime is 21191473. The next prime is 21191531. The reversal of 21191502 is 20519112.

21191502 is nontrivially palindromic in base 7.

It is an interprime number because it is at equal distance from previous prime (21191473) and next prime (21191531).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 29578 + ... + 30285.

It is an arithmetic number, because the mean of its divisors is an integer number (2693880).

Almost surely, 2^21191502 is an apocalyptic number.

21191502 is an abundant number, since it is smaller than the sum of its proper divisors (21910578).

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

21191502 is a wasteful number, since it uses less digits than its factorization.

21191502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59927.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 21191502 is about 4603.4228569620. The cubic root of 21191502 is about 276.7285153900.

The spelling of 21191502 in words is "twenty-one million, one hundred ninety-one thousand, five hundred two".