10212111101021 has 4 divisors (see below), whose sum is σ = 10212347990652. Its totient is φ = 10211874211392.

The previous prime is 10212111101011. The next prime is 10212111101041. The reversal of 10212111101021 is 12010111121201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8135301540025 + 2076809560996 = 2852245^2 + 1441114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10212111101021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10212111100987 and 10212111101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212111101011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118380140 + ... + 118466373.

It is an arithmetic number, because the mean of its divisors is an integer number (2553086997663).

Almost surely, 2^{10212111101021} is an apocalyptic number.

It is an amenable number.

10212111101021 is a deficient number, since it is larger than the sum of its proper divisors (236889631).

10212111101021 is an equidigital number, since it uses as much as digits as its factorization.

10212111101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236889630.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 10212111101021 its reverse (12010111121201), we get a palindrome (22222222222222).

The spelling of 10212111101021 in words is "ten trillion, two hundred twelve billion, one hundred eleven million, one hundred one thousand, twenty-one".