21113202503542 has 16 divisors (see below), whose sum is σ = 32223450918960. Its totient is φ = 10372845957408.

The previous prime is 21113202503501. The next prime is 21113202503551. The reversal of 21113202503542 is 24530520231112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198386617 + ... + 198493012.

It is an arithmetic number, because the mean of its divisors is an integer number (2013965682435).

Almost surely, 2^{21113202503542} is an apocalyptic number.

21113202503542 is a deficient number, since it is larger than the sum of its proper divisors (11110248415418).

21113202503542 is a wasteful number, since it uses less digits than its factorization.

21113202503542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396880095.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 21113202503542 its reverse (24530520231112), we get a palindrome (45643722734654).

The spelling of 21113202503542 in words is "twenty-one trillion, one hundred thirteen billion, two hundred two million, five hundred three thousand, five hundred forty-two".