102220211021021 has 4 divisors (see below), whose sum is σ = 102221083376412. Its totient is φ = 102219338665632.

The previous prime is 102220211020979. The next prime is 102220211021051. The reversal of 102220211021021 is 120120112022201.

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 5503312495396 + 96716898525625 = 2345914^2 + 9834475^2 .

It is a cyclic number.

It is not a de Polignac number, because 102220211021021 - 2⁶ = 102220211020957 is a prime.

It is a super-2 number, since 2×102220211021021² (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 (102220211021051) 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, 436001906 + ... + 436236291.

It is an arithmetic number, because the mean of its divisors is an integer number (25555270844103).

Almost surely, 2^{102220211021021} is an apocalyptic number.

It is an amenable number.

102220211021021 is a deficient number, since it is larger than the sum of its proper divisors (872355391).

102220211021021 is an equidigital number, since it uses as much as digits as its factorization.

102220211021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872355390.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 102220211021021 its reverse (120120112022201), we get a palindrome (222340323043222).

The spelling of 102220211021021 in words is "one hundred two trillion, two hundred twenty billion, two hundred eleven million, twenty-one thousand, twenty-one".