21948053766 has 16 divisors (see below), whose sum is σ = 44724336624. Its totient is φ = 7177979744.

The previous prime is 21948053747. The next prime is 21948053773. The reversal of 21948053766 is 66735084912.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34509201 + ... + 34509836.

It is an arithmetic number, because the mean of its divisors is an integer number (2795271039).

It is a 2-persistent number, because it is pandigital, and so is 2⋅21948053766 = 43896107532, but 3⋅21948053766 = 65844161298 is not.

Almost surely, 2^21948053766 is an apocalyptic number.

21948053766 is the 93698-th centered pentagonal number.

21948053766 is an abundant number, since it is smaller than the sum of its proper divisors (22776282858).

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

21948053766 is a wasteful number, since it uses less digits than its factorization.

21948053766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69019095.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 21948053766 in words is "twenty-one billion, nine hundred forty-eight million, fifty-three thousand, seven hundred sixty-six".