21162141660 has 48 divisors (see below), whose sum is σ = 64640725632. Its totient is φ = 5130216000.

The previous prime is 21162141631. The next prime is 21162141703. The reversal of 21162141660 is 6614126112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16031266 + ... + 16032585.

It is an arithmetic number, because the mean of its divisors is an integer number (1346681784).

Almost surely, 2^21162141660 is an apocalyptic number.

21162141660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21162141660 is an abundant number, since it is smaller than the sum of its proper divisors (43478583972).

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

21162141660 is a wasteful number, since it uses less digits than its factorization.

21162141660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32063874 (or 32063872 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

Adding to 21162141660 its reverse (6614126112), we get a palindrome (27776267772).

The spelling of 21162141660 in words is "twenty-one billion, one hundred sixty-two million, one hundred forty-one thousand, six hundred sixty".