21242402342 has 32 divisors (see below), whose sum is σ = 36860650560. Its totient is φ = 8992811520.

The previous prime is 21242402323. The next prime is 21242402387. The reversal of 21242402342 is 24320424212.

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, 1359092 + ... + 1374632.

It is an arithmetic number, because the mean of its divisors is an integer number (1151895330).

Almost surely, 2^21242402342 is an apocalyptic number.

21242402342 is a deficient number, since it is larger than the sum of its proper divisors (15618248218).

21242402342 is a wasteful number, since it uses less digits than its factorization.

21242402342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16736.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21242402342 its reverse (24320424212), we get a palindrome (45562826554).

The spelling of 21242402342 in words is "twenty-one billion, two hundred forty-two million, four hundred two thousand, three hundred forty-two".