1219721582016 has 420 divisors, whose sum is σ = 4231277387568. Its totient is φ = 346393055232.

The previous prime is 1219721581943. The next prime is 1219721582083. The reversal of 1219721582016 is 6102851279121.

It is a super-2 number, since 2×1219721582016² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 42406296 + ... + 42435048.

Almost surely, 2^{1219721582016} is an apocalyptic number.

1219721582016 is a gapful number since it is divisible by the number (16) 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 1219721582016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2115638693784).

1219721582016 is an abundant number, since it is smaller than the sum of its proper divisors (3011555805552).

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

1219721582016 is a wasteful number, since it uses less digits than its factorization.

1219721582016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28958 (or 28932 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 1219721582016 in words is "one trillion, two hundred nineteen billion, seven hundred twenty-one million, five hundred eighty-two thousand, sixteen".