19021253412 has 96 divisors (see below), whose sum is σ = 51508172800. Its totient is φ = 5351132160.

The previous prime is 19021253411. The next prime is 19021253429. The reversal of 19021253412 is 21435212091.

It is a self number, because there is not a number n which added to its sum of digits gives 19021253412.

It is not an unprimeable number, because it can be changed into a prime (19021253411) 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, 1615587 + ... + 1627317.

Almost surely, 2^19021253412 is an apocalyptic number.

19021253412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19021253412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25754086400).

19021253412 is an abundant number, since it is smaller than the sum of its proper divisors (32486919388).

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

19021253412 is a wasteful number, since it uses less digits than its factorization.

19021253412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12041 (or 12039 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 19021253412 in words is "nineteen billion, twenty-one million, two hundred fifty-three thousand, four hundred twelve".