21054884166 has 24 divisors (see below), whose sum is σ = 48302382024. Its totient is φ = 6605453760.

The previous prime is 21054884161. The next prime is 21054884171. The reversal of 21054884166 is 66148845012.

It is a happy number.

21054884166 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 488 + 4 + 166 = 666.

It is an interprime number because it is at equal distance from previous prime (21054884161) and next prime (21054884171).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054884161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34403100 + ... + 34403711.

It is an arithmetic number, because the mean of its divisors is an integer number (2012599251).

Almost surely, 2^21054884166 is an apocalyptic number.

21054884166 is an abundant number, since it is smaller than the sum of its proper divisors (27247497858).

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

21054884166 is a wasteful number, since it uses less digits than its factorization.

21054884166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68806836 (or 68806833 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 21054884166 in words is "twenty-one billion, fifty-four million, eight hundred eighty-four thousand, one hundred sixty-six".