1221640703 has 2 divisors, whose sum is σ = 1221640704. Its totient is φ = 1221640702.

The previous prime is 1221640691. The next prime is 1221640709. The reversal of 1221640703 is 3070461221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221640703 - 2⁶ = 1221640639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221640709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610820351 + 610820352.

It is an arithmetic number, because the mean of its divisors is an integer number (610820352).

Almost surely, 2^1221640703 is an apocalyptic number.

1221640703 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221640703 is an equidigital number, since it uses as much as digits as its factorization.

1221640703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1221640703 is about 34951.9770971543. The cubic root of 1221640703 is about 1069.0085155652.

The spelling of 1221640703 in words is "one billion, two hundred twenty-one million, six hundred forty thousand, seven hundred three".