19422741951721 has 4 divisors (see below), whose sum is σ = 19422750783744. Its totient is φ = 19422733119700.

The previous prime is 19422741951719. The next prime is 19422741951727. The reversal of 19422741951721 is 12715914722491.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 19422741951721 - 2¹ = 19422741951719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19422741951727) 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, 1787976 + ... + 6484006.

It is an arithmetic number, because the mean of its divisors is an integer number (4855687695936).

Almost surely, 2^{19422741951721} is an apocalyptic number.

It is an amenable number.

19422741951721 is a deficient number, since it is larger than the sum of its proper divisors (8832023).

19422741951721 is an equidigital number, since it uses as much as digits as its factorization.

19422741951721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8832022.

The product of its digits is 2540160, while the sum is 55.

The spelling of 19422741951721 in words is "nineteen trillion, four hundred twenty-two billion, seven hundred forty-one million, nine hundred fifty-one thousand, seven hundred twenty-one".