21001202101027 has 2 divisors, whose sum is σ = 21001202101028. Its totient is φ = 21001202101026.

The previous prime is 21001202100947. The next prime is 21001202101057. The reversal of 21001202101027 is 72010120210012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001202101027 - 2²³ = 21001193712419 is a prime.

It is a super-2 number, since 2×21001202101027² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001202100995 and 21001202101013.

It is not a weakly prime, because it can be changed into another prime (21001202101057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500601050513 + 10500601050514.

It is an arithmetic number, because the mean of its divisors is an integer number (10500601050514).

Almost surely, 2^{21001202101027} is an apocalyptic number.

21001202101027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001202101027 is an equidigital number, since it uses as much as digits as its factorization.

21001202101027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 21001202101027 its reverse (72010120210012), we get a palindrome (93011322311039).

The spelling of 21001202101027 in words is "twenty-one trillion, one billion, two hundred two million, one hundred one thousand, twenty-seven".