21111220121003 has 2 divisors, whose sum is σ = 21111220121004. Its totient is φ = 21111220121002.

The previous prime is 21111220120981. The next prime is 21111220121021. The reversal of 21111220121003 is 30012102211112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111220121003 - 2³⁸ = 20836342214059 is a prime.

It is a super-2 number, since 2×21111220121003² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21111220121603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555610060501 + 10555610060502.

It is an arithmetic number, because the mean of its divisors is an integer number (10555610060502).

Almost surely, 2^{21111220121003} is an apocalyptic number.

21111220121003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111220121003 is an equidigital number, since it uses as much as digits as its factorization.

21111220121003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21111220121003 its reverse (30012102211112), we get a palindrome (51123322332115).

The spelling of 21111220121003 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty million, one hundred twenty-one thousand, three".