21662212060 has 24 divisors (see below), whose sum is σ = 45915796080. Its totient is φ = 8583903744.

The previous prime is 21662212021. The next prime is 21662212087. The reversal of 21662212060 is 6021226612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5059125 + ... + 5063404.

It is an arithmetic number, because the mean of its divisors is an integer number (1913158170).

Almost surely, 2^21662212060 is an apocalyptic number.

21662212060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21662212060 is an abundant number, since it is smaller than the sum of its proper divisors (24253584020).

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

21662212060 is a wasteful number, since it uses less digits than its factorization.

21662212060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10122645 (or 10122643 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 21662212060 its reverse (6021226612), we get a palindrome (27683438672).

The spelling of 21662212060 in words is "twenty-one billion, six hundred sixty-two million, two hundred twelve thousand, sixty".