21641122406 has 16 divisors (see below), whose sum is σ = 32538260304. Its totient is φ = 10795060224.

The previous prime is 21641122403. The next prime is 21641122421. The reversal of 21641122406 is 60422114612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21641122403) 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, 2202701 + ... + 2212503.

It is an arithmetic number, because the mean of its divisors is an integer number (2033641269).

Almost surely, 2^21641122406 is an apocalyptic number.

21641122406 is a deficient number, since it is larger than the sum of its proper divisors (10897137898).

21641122406 is a wasteful number, since it uses less digits than its factorization.

21641122406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12295.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 21641122406 in words is "twenty-one billion, six hundred forty-one million, one hundred twenty-two thousand, four hundred six".