2251719421 has 4 divisors (see below), whose sum is σ = 2573393632. Its totient is φ = 1930045212.

The previous prime is 2251719409. The next prime is 2251719443. The reversal of 2251719421 is 1249171522.

2251719421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2251719421 - 2⁷ = 2251719293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251719461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160837095 + ... + 160837108.

It is an arithmetic number, because the mean of its divisors is an integer number (643348408).

Almost surely, 2^2251719421 is an apocalyptic number.

It is an amenable number.

2251719421 is a deficient number, since it is larger than the sum of its proper divisors (321674211).

2251719421 is an equidigital number, since it uses as much as digits as its factorization.

2251719421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321674210.

The product of its digits is 10080, while the sum is 34.

The square root of 2251719421 is about 47452.2857299835. The cubic root of 2251719421 is about 1310.7044015805.

The spelling of 2251719421 in words is "two billion, two hundred fifty-one million, seven hundred nineteen thousand, four hundred twenty-one".