1921426278912 has 160 divisors (see below), whose sum is σ = 6500063433600. Its totient is φ = 548978909184.

The previous prime is 1921426278869. The next prime is 1921426278913. The reversal of 1921426278912 is 2198726241291.

1921426278912 is a `hidden beast` number, since 1 + 9 + 2 + 1 + 4 + 2 + 627 + 8 + 9 + 1 + 2 = 666.

It is a super-2 number, since 2×1921426278912² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1921426278913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9831237 + ... + 10024772.

It is an arithmetic number, because the mean of its divisors is an integer number (40625396460).

Almost surely, 2^{1921426278912} is an apocalyptic number.

1921426278912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1921426278912 is an abundant number, since it is smaller than the sum of its proper divisors (4578637154688).

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

1921426278912 is an equidigital number, since it uses as much as digits as its factorization.

1921426278912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19856043 (or 19856021 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The spelling of 1921426278912 in words is "one trillion, nine hundred twenty-one billion, four hundred twenty-six million, two hundred seventy-eight thousand, nine hundred twelve".