21023144142 has 192 divisors, whose sum is σ = 58042510848. Its totient is φ = 4989600000.

The previous prime is 21023144137. The next prime is 21023144161. The reversal of 21023144142 is 24144132012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4243767 + ... + 4248717.

It is an arithmetic number, because the mean of its divisors is an integer number (302304744).

Almost surely, 2^21023144142 is an apocalyptic number.

21023144142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023144142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29021255424).

21023144142 is an abundant number, since it is smaller than the sum of its proper divisors (37019366706).

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

21023144142 is a wasteful number, since it uses less digits than its factorization.

21023144142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5095 (or 5088 counting only the distinct ones).

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

Adding to 21023144142 its reverse (24144132012), we get a palindrome (45167276154).

The spelling of 21023144142 in words is "twenty-one billion, twenty-three million, one hundred forty-four thousand, one hundred forty-two".