21101308252 has 12 divisors (see below), whose sum is σ = 36930075280. Its totient is φ = 10549858176.

The previous prime is 21101308231. The next prime is 21101308271. The reversal of 21101308252 is 25280310112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137208 + ... + 247039.

Almost surely, 2^21101308252 is an apocalyptic number.

It is an amenable number.

21101308252 is a deficient number, since it is larger than the sum of its proper divisors (15828767028).

21101308252 is a wasteful number, since it uses less digits than its factorization.

21101308252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397980 (or 397978 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 21101308252 its reverse (25280310112), we get a palindrome (46381618364).

The spelling of 21101308252 in words is "twenty-one billion, one hundred one million, three hundred eight thousand, two hundred fifty-two".