102011243221 has 4 divisors (see below), whose sum is σ = 102015215500. Its totient is φ = 102007270944.

The previous prime is 102011243207. The next prime is 102011243237. The reversal of 102011243221 is 122342110201.

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 18738598321 + 83272644900 = 136889^2 + 288570^2 .

It is a cyclic number.

It is not a de Polignac number, because 102011243221 - 2⁹ = 102011242709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102011243251) 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, 1947366 + ... + 1999063.

It is an arithmetic number, because the mean of its divisors is an integer number (25503803875).

Almost surely, 2^102011243221 is an apocalyptic number.

It is an amenable number.

102011243221 is a deficient number, since it is larger than the sum of its proper divisors (3972279).

102011243221 is an equidigital number, since it uses as much as digits as its factorization.

102011243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972278.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 102011243221 its reverse (122342110201), we get a palindrome (224353353422).

The spelling of 102011243221 in words is "one hundred two billion, eleven million, two hundred forty-three thousand, two hundred twenty-one".