19492227421 has 32 divisors (see below), whose sum is σ = 21710965248. Its totient is φ = 17420943360.

The previous prime is 19492227401. The next prime is 19492227463. The reversal of 19492227421 is 12472229491.

It is a cyclic number.

It is not a de Polignac number, because 19492227421 - 2¹⁵ = 19492194653 is a prime.

It is a super-2 number, since 2×19492227421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19492227401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6320946 + ... + 6324028.

It is an arithmetic number, because the mean of its divisors is an integer number (678467664).

Almost surely, 2^19492227421 is an apocalyptic number.

It is an amenable number.

19492227421 is a deficient number, since it is larger than the sum of its proper divisors (2218737827).

19492227421 is a wasteful number, since it uses less digits than its factorization.

19492227421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381.

The product of its digits is 145152, while the sum is 43.

The spelling of 19492227421 in words is "nineteen billion, four hundred ninety-two million, two hundred twenty-seven thousand, four hundred twenty-one".