2151421229 has 2 divisors, whose sum is σ = 2151421230. Its totient is φ = 2151421228.

The previous prime is 2151421211. The next prime is 2151421291. The reversal of 2151421229 is 9221241512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1639440100 + 511981129 = 40490^2 + 22627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2151421229 is a prime.

It is a super-2 number, since 2×2151421229² = 9257226609183740882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151421429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075710614 + 1075710615.

It is an arithmetic number, because the mean of its divisors is an integer number (1075710615).

Almost surely, 2^2151421229 is an apocalyptic number.

It is an amenable number.

2151421229 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151421229 is an equidigital number, since it uses as much as digits as its factorization.

2151421229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 2151421229 is about 46383.4154520773. The cubic root of 2151421229 is about 1290.9472098954.

The spelling of 2151421229 in words is "two billion, one hundred fifty-one million, four hundred twenty-one thousand, two hundred twenty-nine".