1221723488450 has 24 divisors (see below), whose sum is σ = 2325252336528. Its totient is φ = 477324524880.

The previous prime is 1221723488429. The next prime is 1221723488483. The reversal of 1221723488450 is 548843271221.

It is a junction number, because it is equal to n+sod(n) for n = 1221723488395 and 1221723488404.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 284119592 + ... + 284123891.

It is an arithmetic number, because the mean of its divisors is an integer number (96885514022).

Almost surely, 2^{1221723488450} is an apocalyptic number.

1221723488450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221723488450 is a deficient number, since it is larger than the sum of its proper divisors (1103528848078).

1221723488450 is a wasteful number, since it uses less digits than its factorization.

1221723488450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568243538 (or 568243533 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 47.

The spelling of 1221723488450 in words is "one trillion, two hundred twenty-one billion, seven hundred twenty-three million, four hundred eighty-eight thousand, four hundred fifty".