2121254999 has 2 divisors, whose sum is σ = 2121255000. Its totient is φ = 2121254998.

The previous prime is 2121254963. The next prime is 2121255043. The reversal of 2121254999 is 9994521212.

It is an a-pointer prime, because the next prime (2121255043) can be obtained adding 2121254999 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121254999 - 2¹⁶ = 2121189463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121254599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060627499 + 1060627500.

It is an arithmetic number, because the mean of its divisors is an integer number (1060627500).

Almost surely, 2^2121254999 is an apocalyptic number.

2121254999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121254999 is an equidigital number, since it uses as much as digits as its factorization.

2121254999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 44.

The square root of 2121254999 is about 46057.0841347995. The cubic root of 2121254999 is about 1284.8851000738.

The spelling of 2121254999 in words is "two billion, one hundred twenty-one million, two hundred fifty-four thousand, nine hundred ninety-nine".