21111515342 has 8 divisors (see below), whose sum is σ = 31668276432. Its totient is φ = 10555423200.

The previous prime is 21111515317. The next prime is 21111515363. The reversal of 21111515342 is 24351511112.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79034 + ... + 220157.

It is an arithmetic number, because the mean of its divisors is an integer number (3958534554).

Almost surely, 2^21111515342 is an apocalyptic number.

21111515342 is a deficient number, since it is larger than the sum of its proper divisors (10556761090).

21111515342 is a wasteful number, since it uses less digits than its factorization.

21111515342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334474.

The product of its digits is 1200, while the sum is 26.

The spelling of 21111515342 in words is "twenty-one billion, one hundred eleven million, five hundred fifteen thousand, three hundred forty-two".