21140142342 has 16 divisors (see below), whose sum is σ = 46123947072. Its totient is φ = 6406103720.

The previous prime is 21140142341. The next prime is 21140142377. The reversal of 21140142342 is 24324104112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140142341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160152528 + ... + 160152659.

It is an arithmetic number, because the mean of its divisors is an integer number (2882746692).

Almost surely, 2^21140142342 is an apocalyptic number.

21140142342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21140142342 is an abundant number, since it is smaller than the sum of its proper divisors (24983804730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21140142342 is a wasteful number, since it uses less digits than its factorization.

21140142342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320305203.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21140142342 its reverse (24324104112), we get a palindrome (45464246454).

The spelling of 21140142342 in words is "twenty-one billion, one hundred forty million, one hundred forty-two thousand, three hundred forty-two".