21542502134342 has 32 divisors (see below), whose sum is σ = 37087800628224. Its totient is φ = 9193091241600.

The previous prime is 21542502134323. The next prime is 21542502134431. The reversal of 21542502134342 is 24343120524512.

It is a junction number, because it is equal to n+sod(n) for n = 21542502134296 and 21542502134305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4889342 + ... + 8184782.

It is an arithmetic number, because the mean of its divisors is an integer number (1158993769632).

Almost surely, 2^{21542502134342} is an apocalyptic number.

21542502134342 is a deficient number, since it is larger than the sum of its proper divisors (15545298493882).

21542502134342 is a wasteful number, since it uses less digits than its factorization.

21542502134342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3297444.

The product of its (nonzero) digits is 230400, while the sum is 38.

Adding to 21542502134342 its reverse (24343120524512), we get a palindrome (45885622658854).

The spelling of 21542502134342 in words is "twenty-one trillion, five hundred forty-two billion, five hundred two million, one hundred thirty-four thousand, three hundred forty-two".