2691221090 has 8 divisors (see below), whose sum is σ = 4844197980. Its totient is φ = 1076488432.

The previous prime is 2691221087. The next prime is 2691221129. The reversal of 2691221090 is 901221962.

It can be written as a sum of positive squares in 2 ways, for example, as 2401098001 + 290123089 = 49001^2 + 17033^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134561045 + ... + 134561064.

Almost surely, 2^2691221090 is an apocalyptic number.

2691221090 is a deficient number, since it is larger than the sum of its proper divisors (2152976890).

2691221090 is a wasteful number, since it uses less digits than its factorization.

2691221090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269122116.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 2691221090 is about 51876.9803477419. The cubic root of 2691221090 is about 1390.9658228983.

The spelling of 2691221090 in words is "two billion, six hundred ninety-one million, two hundred twenty-one thousand, ninety".