21161444142 has 64 divisors (see below), whose sum is σ = 45406033920. Its totient is φ = 6555445344.

The previous prime is 21161444141. The next prime is 21161444153. The reversal of 21161444142 is 24144416112.

It is a super-2 number, since 2×21161444142² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161444141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1247973 + ... + 1264815.

It is an arithmetic number, because the mean of its divisors is an integer number (709469280).

Almost surely, 2^21161444142 is an apocalyptic number.

21161444142 is an abundant number, since it is smaller than the sum of its proper divisors (24244589778).

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

21161444142 is a wasteful number, since it uses less digits than its factorization.

21161444142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17077.

The product of its digits is 6144, while the sum is 30.

The spelling of 21161444142 in words is "twenty-one billion, one hundred sixty-one million, four hundred forty-four thousand, one hundred forty-two".