102021111122221 has 4 divisors (see below), whose sum is σ = 102057508239232. Its totient is φ = 101984714005212.

The previous prime is 102021111122209. The next prime is 102021111122233. The reversal of 102021111122221 is 122221111120201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (102021111122209) and next prime (102021111122233).

It is a cyclic number.

It is not a de Polignac number, because 102021111122221 - 2²⁷ = 102020976904493 is a prime.

It is a super-2 number, since 2×102021111122221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021111122521) 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, 18198554301 + ... + 18198559906.

It is an arithmetic number, because the mean of its divisors is an integer number (25514377059808).

Almost surely, 2^{102021111122221} is an apocalyptic number.

It is an amenable number.

102021111122221 is a deficient number, since it is larger than the sum of its proper divisors (36397117011).

102021111122221 is an equidigital number, since it uses as much as digits as its factorization.

102021111122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36397117010.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 102021111122221 its reverse (122221111120201), we get a palindrome (224242222242422).

The spelling of 102021111122221 in words is "one hundred two trillion, twenty-one billion, one hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".