21005014142 has 24 divisors (see below), whose sum is σ = 36731189880. Its totient is φ = 8982602160.

The previous prime is 21005014141. The next prime is 21005014183. The reversal of 21005014142 is 24141050012.

It is a happy number.

It is a super-3 number, since 3×21005014142³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21005014141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187292 + ... + 277647.

It is an arithmetic number, because the mean of its divisors is an integer number (1530466245).

Almost surely, 2^21005014142 is an apocalyptic number.

21005014142 is a deficient number, since it is larger than the sum of its proper divisors (15726175738).

21005014142 is a wasteful number, since it uses less digits than its factorization.

21005014142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465416 (or 465409 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21005014142 its reverse (24141050012), we get a palindrome (45146064154).

The spelling of 21005014142 in words is "twenty-one billion, five million, fourteen thousand, one hundred forty-two".