21421122142 has 24 divisors (see below), whose sum is σ = 37385281296. Its totient is φ = 9178612128.

The previous prime is 21421122097. The next prime is 21421122143. The reversal of 21421122142 is 24122112412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421122143) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 531618 + ... + 570490.

It is an arithmetic number, because the mean of its divisors is an integer number (1557720054).

Almost surely, 2^21421122142 is an apocalyptic number.

21421122142 is a deficient number, since it is larger than the sum of its proper divisors (15964159154).

21421122142 is a wasteful number, since it uses less digits than its factorization.

21421122142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44512 (or 44505 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

Adding to 21421122142 its reverse (24122112412), we get a palindrome (45543234554).

The spelling of 21421122142 in words is "twenty-one billion, four hundred twenty-one million, one hundred twenty-two thousand, one hundred forty-two".