2123950421 has 2 divisors, whose sum is σ = 2123950422. Its totient is φ = 2123950420.

The previous prime is 2123950393. The next prime is 2123950427. The reversal of 2123950421 is 1240593212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1088076196 + 1035874225 = 32986^2 + 32185^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123950421 - 2¹⁴ = 2123934037 is a prime.

It is a super-2 number, since 2×2123950421² = 9022330781732154482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123950427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061975210 + 1061975211.

It is an arithmetic number, because the mean of its divisors is an integer number (1061975211).

Almost surely, 2^2123950421 is an apocalyptic number.

It is an amenable number.

2123950421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123950421 is an equidigital number, since it uses as much as digits as its factorization.

2123950421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 2123950421 is about 46086.3365977379. The cubic root of 2123950421 is about 1285.4290927717.

The spelling of 2123950421 in words is "two billion, one hundred twenty-three million, nine hundred fifty thousand, four hundred twenty-one".