21113003542 has 8 divisors (see below), whose sum is σ = 31670482536. Its totient is φ = 10556176032.

The previous prime is 21113003533. The next prime is 21113003543. The reversal of 21113003542 is 24530031112.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113003543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71628 + ... + 217615.

It is an arithmetic number, because the mean of its divisors is an integer number (3958810317).

Almost surely, 2^21113003542 is an apocalyptic number.

21113003542 is a deficient number, since it is larger than the sum of its proper divisors (10557478994).

21113003542 is a wasteful number, since it uses less digits than its factorization.

21113003542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325742.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21113003542 its reverse (24530031112), we get a palindrome (45643034654).

The spelling of 21113003542 in words is "twenty-one billion, one hundred thirteen million, three thousand, five hundred forty-two".