21143022142 has 16 divisors (see below), whose sum is σ = 34600834800. Its totient is φ = 9609586240.

The previous prime is 21143022119. The next prime is 21143022151. The reversal of 21143022142 is 24122034112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244284 + ... + 319312.

It is an arithmetic number, because the mean of its divisors is an integer number (2162552175).

Almost surely, 2^21143022142 is an apocalyptic number.

21143022142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21143022142 is a deficient number, since it is larger than the sum of its proper divisors (13457812658).

21143022142 is a wasteful number, since it uses less digits than its factorization.

21143022142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87851.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21143022142 its reverse (24122034112), we get a palindrome (45265056254).

The spelling of 21143022142 in words is "twenty-one billion, one hundred forty-three million, twenty-two thousand, one hundred forty-two".