21842687542 has 16 divisors (see below), whose sum is σ = 35397808992. Its totient is φ = 10048821120.

The previous prime is 21842687521. The next prime is 21842687599. The reversal of 21842687542 is 24578624812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1342563 + ... + 1358734.

It is an arithmetic number, because the mean of its divisors is an integer number (2212363062).

Almost surely, 2^21842687542 is an apocalyptic number.

21842687542 is a deficient number, since it is larger than the sum of its proper divisors (13555121450).

21842687542 is a wasteful number, since it uses less digits than its factorization.

21842687542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2701623.

The product of its digits is 1720320, while the sum is 49.

The spelling of 21842687542 in words is "twenty-one billion, eight hundred forty-two million, six hundred eighty-seven thousand, five hundred forty-two".