2129980421 has 2 divisors, whose sum is σ = 2129980422. Its totient is φ = 2129980420.

The previous prime is 2129980397. The next prime is 2129980441. The reversal of 2129980421 is 1240899212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1972603396 + 157377025 = 44414^2 + 12545^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129980421 - 2²⁶ = 2062871557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2129980441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064990210 + 1064990211.

It is an arithmetic number, because the mean of its divisors is an integer number (1064990211).

Almost surely, 2^2129980421 is an apocalyptic number.

It is an amenable number.

2129980421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2129980421 is an equidigital number, since it uses as much as digits as its factorization.

2129980421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 2129980421 is about 46151.7109216982. The cubic root of 2129980421 is about 1286.6444089131.

The spelling of 2129980421 in words is "two billion, one hundred twenty-nine million, nine hundred eighty thousand, four hundred twenty-one".