21012020220203 has 2 divisors, whose sum is σ = 21012020220204. Its totient is φ = 21012020220202.

The previous prime is 21012020220101. The next prime is 21012020220241. The reversal of 21012020220203 is 30202202021012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012020220203 - 2²² = 21012016025899 is a prime.

It is a super-2 number, since 2×21012020220203² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21012020220703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506010110101 + 10506010110102.

It is an arithmetic number, because the mean of its divisors is an integer number (10506010110102).

Almost surely, 2^{21012020220203} is an apocalyptic number.

21012020220203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012020220203 is an equidigital number, since it uses as much as digits as its factorization.

21012020220203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21012020220203 its reverse (30202202021012), we get a palindrome (51214222241215).

The spelling of 21012020220203 in words is "twenty-one trillion, twelve billion, twenty million, two hundred twenty thousand, two hundred three".