1221962219776 has 81 divisors (see below), whose sum is σ = 2483314075263. Its totient is φ = 600112581120.

The previous prime is 1221962219761. The next prime is 1221962219783. The reversal of 1221962219776 is 6779122691221.

The square root of 1221962219776 is 1105424.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1043519671 + ... + 1043520841.

Almost surely, 2^{1221962219776} is an apocalyptic number.

1221962219776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1221962219776 is the 1105424-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221962219776

1221962219776 is an abundant number, since it is smaller than the sum of its proper divisors (1261351855487).

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

1221962219776 is an frugal number, since it uses more digits than its factorization.

1221962219776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476 (or 1232 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 55.

The spelling of 1221962219776 in words is "one trillion, two hundred twenty-one billion, nine hundred sixty-two million, two hundred nineteen thousand, seven hundred seventy-six".