19426750021 has 4 divisors (see below), whose sum is σ = 22202000032. Its totient is φ = 16651500012.

The previous prime is 19426749997. The next prime is 19426750037. The reversal of 19426750021 is 12005762491.

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 19426750021 - 2¹¹ = 19426747973 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 (19426750121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387624995 + ... + 1387625008.

It is an arithmetic number, because the mean of its divisors is an integer number (5550500008).

Almost surely, 2^19426750021 is an apocalyptic number.

It is an amenable number.

19426750021 is a deficient number, since it is larger than the sum of its proper divisors (2775250011).

19426750021 is an equidigital number, since it uses as much as digits as its factorization.

19426750021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775250010.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 19426750021 in words is "nineteen billion, four hundred twenty-six million, seven hundred fifty thousand, twenty-one".