2121099947 has 2 divisors, whose sum is σ = 2121099948. Its totient is φ = 2121099946.

The previous prime is 2121099931. The next prime is 2121099983. The reversal of 2121099947 is 7499901212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121099947 - 2⁴ = 2121099931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121099898 and 2121099907.

It is not a weakly prime, because it can be changed into another prime (2121099907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060549973 + 1060549974.

It is an arithmetic number, because the mean of its divisors is an integer number (1060549974).

Almost surely, 2^2121099947 is an apocalyptic number.

2121099947 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121099947 is an equidigital number, since it uses as much as digits as its factorization.

2121099947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 2121099947 is about 46055.4008450692. The cubic root of 2121099947 is about 1284.8537933145.

The spelling of 2121099947 in words is "two billion, one hundred twenty-one million, ninety-nine thousand, nine hundred forty-seven".