27721212772 has 18 divisors (see below), whose sum is σ = 53323242854. Its totient is φ = 12600551040.

The previous prime is 27721212769. The next prime is 27721212787.

27721212772 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 24591257856 + 3129954916 = 156816^2 + 55946^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28637133 + ... + 28638100.

Almost surely, 2^27721212772 is an apocalyptic number.

27721212772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

27721212772 is a deficient number, since it is larger than the sum of its proper divisors (25602030082).

27721212772 is a wasteful number, since it uses less digits than its factorization.

27721212772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57275259 (or 57275246 counting only the distinct ones).

The product of its digits is 76832, while the sum is 40.

The spelling of 27721212772 in words is "twenty-seven billion, seven hundred twenty-one million, two hundred twelve thousand, seven hundred seventy-two".