2134721851 has 2 divisors, whose sum is σ = 2134721852. Its totient is φ = 2134721850.

The previous prime is 2134721837. The next prime is 2134721873. The reversal of 2134721851 is 1581274312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2134721851 - 2⁹ = 2134721339 is a prime.

It is a super-2 number, since 2×2134721851² = 9114074762273732402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2134721891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1067360925 + 1067360926.

It is an arithmetic number, because the mean of its divisors is an integer number (1067360926).

Almost surely, 2^2134721851 is an apocalyptic number.

2134721851 is a deficient number, since it is larger than the sum of its proper divisors (1).

2134721851 is an equidigital number, since it uses as much as digits as its factorization.

2134721851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 34.

The square root of 2134721851 is about 46203.0502348059. The cubic root of 2134721851 is about 1287.5984103745.

The spelling of 2134721851 in words is "two billion, one hundred thirty-four million, seven hundred twenty-one thousand, eight hundred fifty-one".