21161013141612 has 24 divisors (see below), whose sum is σ = 49376043430000. Its totient is φ = 7053621604416.

The previous prime is 21161013141601. The next prime is 21161013141617. The reversal of 21161013141612 is 21614131016112.

It is a self number, because there is not a number n which added to its sum of digits gives 21161013141612.

It is not an unprimeable number, because it can be changed into a prime (21161013141617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4375987 + ... + 7840362.

Almost surely, 2^{21161013141612} is an apocalyptic number.

It is an amenable number.

21161013141612 is an abundant number, since it is smaller than the sum of its proper divisors (28215030288388).

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

21161013141612 is a wasteful number, since it uses less digits than its factorization.

21161013141612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12360705 (or 12360703 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

Adding to 21161013141612 its reverse (21614131016112), we get a palindrome (42775144157724).

The spelling of 21161013141612 in words is "twenty-one trillion, one hundred sixty-one billion, thirteen million, one hundred forty-one thousand, six hundred twelve".