2129377221 has 16 divisors (see below), whose sum is σ = 3158102400. Its totient is φ = 1418023584.

The previous prime is 2129377219. The next prime is 2129377301. The reversal of 2129377221 is 1227739212.

It is not a de Polignac number, because 2129377221 - 2¹ = 2129377219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129877221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18096 + ... + 67721.

It is an arithmetic number, because the mean of its divisors is an integer number (197381400).

Almost surely, 2^2129377221 is an apocalyptic number.

It is an amenable number.

2129377221 is a deficient number, since it is larger than the sum of its proper divisors (1028725179).

2129377221 is an equidigital number, since it uses as much as digits as its factorization.

2129377221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86745 (or 86739 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 2129377221 is about 46145.1754899686. The cubic root of 2129377221 is about 1286.5229403189.

The spelling of 2129377221 in words is "two billion, one hundred twenty-nine million, three hundred seventy-seven thousand, two hundred twenty-one".