2151421429 has 2 divisors, whose sum is σ = 2151421430. Its totient is φ = 2151421428.

The previous prime is 2151421423. The next prime is 2151421453. The reversal of 2151421429 is 9241241512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2040961329 + 110460100 = 45177^2 + 10510^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151421429 - 2¹⁵ = 2151388661 is a prime.

It is a super-2 number, since 2×2151421429² = 9257228330320804082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2151421429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151421423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075710714 + 1075710715.

It is an arithmetic number, because the mean of its divisors is an integer number (1075710715).

Almost surely, 2^2151421429 is an apocalyptic number.

It is an amenable number.

2151421429 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151421429 is an equidigital number, since it uses as much as digits as its factorization.

2151421429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 31.

The square root of 2151421429 is about 46383.4176080202. The cubic root of 2151421429 is about 1290.9472498983.

The spelling of 2151421429 in words is "two billion, one hundred fifty-one million, four hundred twenty-one thousand, four hundred twenty-nine".