2519838221961 has 4 divisors (see below), whose sum is σ = 3359784295952. Its totient is φ = 1679892147972.

The previous prime is 2519838221951. The next prime is 2519838221981. The reversal of 2519838221961 is 1691228389152.

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 not a de Polignac number, because 2519838221961 - 2³³ = 2511248287369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2519838221951) 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, 419973036991 + ... + 419973036996.

It is an arithmetic number, because the mean of its divisors is an integer number (839946073988).

Almost surely, 2^{2519838221961} is an apocalyptic number.

It is an amenable number.

2519838221961 is a deficient number, since it is larger than the sum of its proper divisors (839946073991).

2519838221961 is an equidigital number, since it uses as much as digits as its factorization.

2519838221961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839946073990.

The product of its digits is 3732480, while the sum is 57.

The spelling of 2519838221961 in words is "two trillion, five hundred nineteen billion, eight hundred thirty-eight million, two hundred twenty-one thousand, nine hundred sixty-one".