21401620110643 has 16 divisors (see below), whose sum is σ = 22568600466720. Its totient is φ = 20263628729344.

The previous prime is 21401620110599. The next prime is 21401620110679. The reversal of 21401620110643 is 34601102610412.

It is a cyclic number.

It is not a de Polignac number, because 21401620110643 - 2⁹ = 21401620110131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21401620110043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397246 + ... + 6554467.

It is an arithmetic number, because the mean of its divisors is an integer number (1410537529170).

Almost surely, 2^{21401620110643} is an apocalyptic number.

21401620110643 is a deficient number, since it is larger than the sum of its proper divisors (1166980356077).

21401620110643 is a wasteful number, since it uses less digits than its factorization.

21401620110643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6953798.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 21401620110643 in words is "twenty-one trillion, four hundred one billion, six hundred twenty million, one hundred ten thousand, six hundred forty-three".