102021211111021 has 4 divisors (see below), whose sum is σ = 108022458823452. Its totient is φ = 96019963398592.

The previous prime is 102021211111009. The next prime is 102021211111093. The reversal of 102021211111021 is 120111112120201.

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 56595363494121 + 45425847616900 = 7522989^2 + 6739870^2 .

It is a cyclic number.

It is not a de Polignac number, because 102021211111021 - 2⁷ = 102021211110893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102021211110986 and 102021211111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021211111121) 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, 3000623856190 + ... + 3000623856223.

It is an arithmetic number, because the mean of its divisors is an integer number (27005614705863).

Almost surely, 2^{102021211111021} is an apocalyptic number.

It is an amenable number.

102021211111021 is a deficient number, since it is larger than the sum of its proper divisors (6001247712431).

102021211111021 is an equidigital number, since it uses as much as digits as its factorization.

102021211111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6001247712430.

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

Adding to 102021211111021 its reverse (120111112120201), we get a palindrome (222132323231222).

The spelling of 102021211111021 in words is "one hundred two trillion, twenty-one billion, two hundred eleven million, one hundred eleven thousand, twenty-one".