21123314142 has 32 divisors (see below), whose sum is σ = 48286713600. Its totient is φ = 6034626048.

The previous prime is 21123314119. The next prime is 21123314167. The reversal of 21123314142 is 24141332112.

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, 553534 + ... + 590462.

It is an arithmetic number, because the mean of its divisors is an integer number (1508959800).

Almost surely, 2^21123314142 is an apocalyptic number.

21123314142 is an abundant number, since it is smaller than the sum of its proper divisors (27163399458).

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

21123314142 is a wasteful number, since it uses less digits than its factorization.

21123314142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50560.

The product of its digits is 1152, while the sum is 24.

Adding to 21123314142 its reverse (24141332112), we get a palindrome (45264646254).

The spelling of 21123314142 in words is "twenty-one billion, one hundred twenty-three million, three hundred fourteen thousand, one hundred forty-two".