1221220121003 has 2 divisors, whose sum is σ = 1221220121004. Its totient is φ = 1221220121002.

The previous prime is 1221220120999. The next prime is 1221220121039. The reversal of 1221220121003 is 3001210221221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221220121003 - 2² = 1221220120999 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221220151003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610060501 + 610610060502.

It is an arithmetic number, because the mean of its divisors is an integer number (610610060502).

Almost surely, 2^{1221220121003} is an apocalyptic number.

1221220121003 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221220121003 is an equidigital number, since it uses as much as digits as its factorization.

1221220121003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1221220121003 its reverse (3001210221221), we get a palindrome (4222430342224).

The spelling of 1221220121003 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, three".