21130245142 has 16 divisors (see below), whose sum is σ = 31939987392. Its totient is φ = 10483647040.

The previous prime is 21130245139. The next prime is 21130245167. The reversal of 21130245142 is 24154203112.

It is a super-2 number, since 2×21130245142² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703443 + ... + 732865.

It is an arithmetic number, because the mean of its divisors is an integer number (1996249212).

Almost surely, 2^21130245142 is an apocalyptic number.

21130245142 is a deficient number, since it is larger than the sum of its proper divisors (10809742250).

21130245142 is a wasteful number, since it uses less digits than its factorization.

21130245142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32183.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21130245142 its reverse (24154203112), we get a palindrome (45284448254).

The spelling of 21130245142 in words is "twenty-one billion, one hundred thirty million, two hundred forty-five thousand, one hundred forty-two".