21211011020101 has 16 divisors (see below), whose sum is σ = 24250375843200. Its totient is φ = 18173952580608.

The previous prime is 21211011020053. The next prime is 21211011020249. The reversal of 21211011020101 is 10102011011212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21211011020101 - 2⁷ = 21211011019973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211011020401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222306261 + ... + 222401653.

It is an arithmetic number, because the mean of its divisors is an integer number (1515648490200).

Almost surely, 2^{21211011020101} is an apocalyptic number.

It is an amenable number.

21211011020101 is a deficient number, since it is larger than the sum of its proper divisors (3039364823099).

21211011020101 is an equidigital number, since it uses as much as digits as its factorization.

21211011020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107148.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21211011020101 its reverse (10102011011212), we get a palindrome (31313022031313).

The spelling of 21211011020101 in words is "twenty-one trillion, two hundred eleven billion, eleven million, twenty thousand, one hundred one".