2151348421 has 2 divisors, whose sum is σ = 2151348422. Its totient is φ = 2151348420.

The previous prime is 2151348413. The next prime is 2151348449. The reversal of 2151348421 is 1248431512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1791828900 + 359519521 = 42330^2 + 18961^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151348421 - 2³ = 2151348413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151348481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075674210 + 1075674211.

It is an arithmetic number, because the mean of its divisors is an integer number (1075674211).

Almost surely, 2^2151348421 is an apocalyptic number.

It is an amenable number.

2151348421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151348421 is an equidigital number, since it uses as much as digits as its factorization.

2151348421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 31.

The square root of 2151348421 is about 46382.6305959462. The cubic root of 2151348421 is about 1290.9326470654.

Adding to 2151348421 its reverse (1248431512), we get a palindrome (3399779933).

The spelling of 2151348421 in words is "two billion, one hundred fifty-one million, three hundred forty-eight thousand, four hundred twenty-one".