2121292787 has 2 divisors, whose sum is σ = 2121292788. Its totient is φ = 2121292786.

The previous prime is 2121292781. The next prime is 2121292889. The reversal of 2121292787 is 7872921212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121292787 - 2⁸ = 2121292531 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (2121292781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060646393 + 1060646394.

It is an arithmetic number, because the mean of its divisors is an integer number (1060646394).

Almost surely, 2^2121292787 is an apocalyptic number.

2121292787 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121292787 is an equidigital number, since it uses as much as digits as its factorization.

2121292787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 2121292787 is about 46057.4943630241. The cubic root of 2121292787 is about 1284.8927296688.

The spelling of 2121292787 in words is "two billion, one hundred twenty-one million, two hundred ninety-two thousand, seven hundred eighty-seven".