102022111021 has 4 divisors (see below), whose sum is σ = 102031108732. Its totient is φ = 102013113312.

The previous prime is 102022111013. The next prime is 102022111031. The reversal of 102022111021 is 120111220201.

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 64815558921 + 37206552100 = 254589^2 + 192890^2 .

It is a cyclic number.

It is not a de Polignac number, because 102022111021 - 2³ = 102022111013 is a prime.

It is a super-4 number, since 4×102022111021⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102022110992 and 102022111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102022111031) 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, 4481826 + ... + 4504531.

It is an arithmetic number, because the mean of its divisors is an integer number (25507777183).

Almost surely, 2^102022111021 is an apocalyptic number.

It is an amenable number.

102022111021 is a deficient number, since it is larger than the sum of its proper divisors (8997711).

102022111021 is an equidigital number, since it uses as much as digits as its factorization.

102022111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8997710.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 102022111021 its reverse (120111220201), we get a palindrome (222133331222).

The spelling of 102022111021 in words is "one hundred two billion, twenty-two million, one hundred eleven thousand, twenty-one".