102211022020021 has 4 divisors (see below), whose sum is σ = 102211062102252. Its totient is φ = 102210981937792.

The previous prime is 102211022020001. The next prime is 102211022020031. The reversal of 102211022020021 is 120020220112201.

It is a happy number.

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 11682457397521 + 90528564622500 = 3417961^2 + 9514650^2 .

It is a cyclic number.

It is not a de Polignac number, because 102211022020021 - 2¹⁹ = 102211021495733 is a prime.

It is a super-3 number, since 3×102211022020021³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102211022019977 and 102211022020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102211022020001) 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, 15935740 + ... + 21409573.

It is an arithmetic number, because the mean of its divisors is an integer number (25552765525563).

Almost surely, 2^{102211022020021} is an apocalyptic number.

It is an amenable number.

102211022020021 is a deficient number, since it is larger than the sum of its proper divisors (40082231).

102211022020021 is an equidigital number, since it uses as much as digits as its factorization.

102211022020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40082230.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 102211022020021 its reverse (120020220112201), we get a palindrome (222231242132222).

The spelling of 102211022020021 in words is "one hundred two trillion, two hundred eleven billion, twenty-two million, twenty thousand, twenty-one".