21168411690 has 32 divisors (see below), whose sum is σ = 52443035136. Its totient is φ = 5462815680.

The previous prime is 21168411647. The next prime is 21168411703. The reversal of 21168411690 is 9611486112.

It is a super-3 number, since 3×21168411690³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon 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, 11379937 + ... + 11381796.

It is an arithmetic number, because the mean of its divisors is an integer number (1638844848).

Almost surely, 2^21168411690 is an apocalyptic number.

21168411690 is an abundant number, since it is smaller than the sum of its proper divisors (31274623446).

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

21168411690 is a wasteful number, since it uses less digits than its factorization.

21168411690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22761774.

The product of its (nonzero) digits is 20736, while the sum is 39.

The spelling of 21168411690 in words is "twenty-one billion, one hundred sixty-eight million, four hundred eleven thousand, six hundred ninety".