21612142160 has 80 divisors (see below), whose sum is σ = 60804608256. Its totient is φ = 6973999104.

The previous prime is 21612142141. The next prime is 21612142163. The reversal of 21612142160 is 6124121612.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612142163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1125572 + ... + 1144611.

Almost surely, 2^21612142160 is an apocalyptic number.

21612142160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21612142160 is an abundant number, since it is smaller than the sum of its proper divisors (39192466096).

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

21612142160 is a wasteful number, since it uses less digits than its factorization.

21612142160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270220 (or 2270214 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

Adding to 21612142160 its reverse (6124121612), we get a palindrome (27736263772).

The spelling of 21612142160 in words is "twenty-one billion, six hundred twelve million, one hundred forty-two thousand, one hundred sixty".