2171028772 has 24 divisors (see below), whose sum is σ = 4181379552. Its totient is φ = 978096000.

The previous prime is 2171028733. The next prime is 2171028779. The reversal of 2171028772 is 2778201712.

It is not an unprimeable number, because it can be changed into a prime (2171028779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213354 + ... + 223297.

It is an arithmetic number, because the mean of its divisors is an integer number (174224148).

Almost surely, 2^2171028772 is an apocalyptic number.

2171028772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2171028772 is a deficient number, since it is larger than the sum of its proper divisors (2010350780).

2171028772 is a wasteful number, since it uses less digits than its factorization.

2171028772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436779 (or 436777 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 37.

The square root of 2171028772 is about 46594.2997801233. The cubic root of 2171028772 is about 1294.8571513497.

The spelling of 2171028772 in words is "two billion, one hundred seventy-one million, twenty-eight thousand, seven hundred seventy-two".