21053272277 has 6 divisors (see below), whose sum is σ = 22364549058. Its totient is φ = 19814844224.

The previous prime is 21053272267. The next prime is 21053272291. The reversal of 21053272277 is 77227235012.

It can be written as a sum of positive squares in 3 ways, for example, as 11982805156 + 9070467121 = 109466^2 + 95239^2 .

It is not a de Polignac number, because 21053272277 - 2¹⁸ = 21053010133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21053272277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21053272217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36424058 + ... + 36424635.

It is an arithmetic number, because the mean of its divisors is an integer number (3727424843).

Almost surely, 2^21053272277 is an apocalyptic number.

It is an amenable number.

21053272277 is a deficient number, since it is larger than the sum of its proper divisors (1311276781).

21053272277 is an equidigital number, since it uses as much as digits as its factorization.

21053272277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72848727 (or 72848710 counting only the distinct ones).

The product of its (nonzero) digits is 82320, while the sum is 38.

The spelling of 21053272277 in words is "twenty-one billion, fifty-three million, two hundred seventy-two thousand, two hundred seventy-seven".