21115540135342 has 8 divisors (see below), whose sum is σ = 31809247157376. Its totient is φ = 10512457749552.

The previous prime is 21115540135337. The next prime is 21115540135381. The reversal of 21115540135342 is 24353104551112.

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, 22656158478 + ... + 22656159409.

It is an arithmetic number, because the mean of its divisors is an integer number (3976155894672).

Almost surely, 2^{21115540135342} is an apocalyptic number.

21115540135342 is a deficient number, since it is larger than the sum of its proper divisors (10693707022034).

21115540135342 is a wasteful number, since it uses less digits than its factorization.

21115540135342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45312318122.

The product of its (nonzero) digits is 72000, while the sum is 37.

Adding to 21115540135342 its reverse (24353104551112), we get a palindrome (45468644686454).

The spelling of 21115540135342 in words is "twenty-one trillion, one hundred fifteen billion, five hundred forty million, one hundred thirty-five thousand, three hundred forty-two".