21940045166 has 16 divisors (see below), whose sum is σ = 35445516624. Its totient is φ = 10125058944.

The previous prime is 21940045163. The next prime is 21940045177. The reversal of 21940045166 is 66154004912.

It is a super-2 number, since 2×21940045166² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21940045163) by changing a digit.

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, 223625 + ... + 306411.

It is an arithmetic number, because the mean of its divisors is an integer number (2215344789).

Almost surely, 2^21940045166 is an apocalyptic number.

21940045166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21940045166 is a deficient number, since it is larger than the sum of its proper divisors (13505471458).

21940045166 is a wasteful number, since it uses less digits than its factorization.

21940045166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92995.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 21940045166 in words is "twenty-one billion, nine hundred forty million, forty-five thousand, one hundred sixty-six".