21115102 has 8 divisors (see below), whose sum is σ = 31726656. Its totient is φ = 10539552.

The previous prime is 21115093. The next prime is 21115141. The reversal of 21115102 is 20151112.

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

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 3 ways as a sum of consecutive naturals, for example, 7483 + ... + 9910.

It is an arithmetic number, because the mean of its divisors is an integer number (3965832).

Almost surely, 2^21115102 is an apocalyptic number.

21115102 is a deficient number, since it is larger than the sum of its proper divisors (10611554).

21115102 is a wasteful number, since it uses less digits than its factorization.

21115102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18002.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 21115102 is about 4595.1171911062. The cubic root of 21115102 is about 276.3955593331.

Adding to 21115102 its reverse (20151112), we get a palindrome (41266214).

It can be divided in two parts, 21 and 115102, that multiplied together give a palindrome (2417142).

The spelling of 21115102 in words is "twenty-one million, one hundred fifteen thousand, one hundred two".