1221779931703 has 16 divisors (see below), whose sum is σ = 1252789455456. Its totient is φ = 1191228825600.

The previous prime is 1221779931683. The next prime is 1221779931737. The reversal of 1221779931703 is 3071399771221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1221779931703 - 2⁹ = 1221779931191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221779931503) 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, 2627053 + ... + 3056953.

It is an arithmetic number, because the mean of its divisors is an integer number (78299340966).

Almost surely, 2^{1221779931703} is an apocalyptic number.

1221779931703 is a deficient number, since it is larger than the sum of its proper divisors (31009523753).

1221779931703 is an equidigital number, since it uses as much as digits as its factorization.

1221779931703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430434.

The product of its (nonzero) digits is 1000188, while the sum is 52.

The spelling of 1221779931703 in words is "one trillion, two hundred twenty-one billion, seven hundred seventy-nine million, nine hundred thirty-one thousand, seven hundred three".