21122502 has 16 divisors (see below), whose sum is σ = 42432240. Its totient is φ = 7009632.

The previous prime is 21122473. The next prime is 21122561. The reversal of 21122502 is 20522112.

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 7 ways as a sum of consecutive naturals, for example, 6313 + ... + 9060.

It is an arithmetic number, because the mean of its divisors is an integer number (2652015).

Almost surely, 2^21122502 is an apocalyptic number.

21122502 is an abundant number, since it is smaller than the sum of its proper divisors (21309738).

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

21122502 is a wasteful number, since it uses less digits than its factorization.

21122502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15607.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21122502 is about 4595.9223231034. The cubic root of 21122502 is about 276.4278440970.

Adding to 21122502 its reverse (20522112), we get a palindrome (41644614).

The spelling of 21122502 in words is "twenty-one million, one hundred twenty-two thousand, five hundred two".