10101111022021 has 4 divisors (see below), whose sum is σ = 10101117381292. Its totient is φ = 10101104662752.

The previous prime is 10101111021997. The next prime is 10101111022039. The reversal of 10101111022021 is 12022011110101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3654788062500 + 6446322959521 = 1911750^2 + 2538961^2 .

It is a cyclic number.

It is not a de Polignac number, because 10101111022021 - 2¹⁹ = 10101110497733 is a prime.

It is a super-2 number, since 2×10101111022021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10101111021992 and 10101111022010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101111022091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1447771 + ... + 4722103.

It is an arithmetic number, because the mean of its divisors is an integer number (2525279345323).

Almost surely, 2^{10101111022021} is an apocalyptic number.

It is an amenable number.

10101111022021 is a deficient number, since it is larger than the sum of its proper divisors (6359271).

10101111022021 is an equidigital number, since it uses as much as digits as its factorization.

10101111022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6359270.

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

Adding to 10101111022021 its reverse (12022011110101), we get a palindrome (22123122132122).

The spelling of 10101111022021 in words is "ten trillion, one hundred one billion, one hundred eleven million, twenty-two thousand, twenty-one".