2121019997 has 2 divisors, whose sum is σ = 2121019998. Its totient is φ = 2121019996.

The previous prime is 2121019993. The next prime is 2121020039. The reversal of 2121019997 is 7999101212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1533975556 + 587044441 = 39166^2 + 24229^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121019997 - 2² = 2121019993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121019993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060509998 + 1060509999.

It is an arithmetic number, because the mean of its divisors is an integer number (1060509999).

Almost surely, 2^2121019997 is an apocalyptic number.

It is an amenable number.

2121019997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121019997 is an equidigital number, since it uses as much as digits as its factorization.

2121019997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 41.

The square root of 2121019997 is about 46054.5328605122. The cubic root of 2121019997 is about 1284.8376499056.

The spelling of 2121019997 in words is "two billion, one hundred twenty-one million, nineteen thousand, nine hundred ninety-seven".