19121222450 has 24 divisors (see below), whose sum is σ = 38798699760. Its totient is φ = 6953171600.

The previous prime is 19121222441. The next prime is 19121222459. The reversal of 19121222450 is 5422212191.

It is an interprime number because it is at equal distance from previous prime (19121222441) and next prime (19121222459).

It is a super-2 number, since 2×19121222450² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19121222459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17382380 + ... + 17383479.

It is an arithmetic number, because the mean of its divisors is an integer number (1616612490).

Almost surely, 2^19121222450 is an apocalyptic number.

19121222450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19121222450 is an abundant number, since it is smaller than the sum of its proper divisors (19677477310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19121222450 is a wasteful number, since it uses less digits than its factorization.

19121222450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34765882 (or 34765877 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 19121222450 in words is "nineteen billion, one hundred twenty-one million, two hundred twenty-two thousand, four hundred fifty".