21140342142 has 16 divisors (see below), whose sum is σ = 42456125712. Its totient is φ = 7017540480.

The previous prime is 21140342131. The next prime is 21140342143. The reversal of 21140342142 is 24124304112.

It is a super-2 number, since 2×21140342142² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140342143) 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, 7308493 + ... + 7311384.

It is an arithmetic number, because the mean of its divisors is an integer number (2653507857).

Almost surely, 2^21140342142 is an apocalyptic number.

21140342142 is an abundant number, since it is smaller than the sum of its proper divisors (21315783570).

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

21140342142 is a wasteful number, since it uses less digits than its factorization.

21140342142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14620123.

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

Adding to 21140342142 its reverse (24124304112), we get a palindrome (45264646254).

The spelling of 21140342142 in words is "twenty-one billion, one hundred forty million, three hundred forty-two thousand, one hundred forty-two".