122512040221 has 4 divisors (see below), whose sum is σ = 122898513852. Its totient is φ = 122125566592.

The previous prime is 122512040173. The next prime is 122512040239. The reversal of 122512040221 is 122040215221.

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 8901922500 + 113610117721 = 94350^2 + 337061^2 .

It is a cyclic number.

It is not a de Polignac number, because 122512040221 - 2⁹ = 122512039709 is a prime.

It is a super-2 number, since 2×122512040221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122512040192 and 122512040201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122518040221) 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, 193236340 + ... + 193236973.

It is an arithmetic number, because the mean of its divisors is an integer number (30724628463).

Almost surely, 2^122512040221 is an apocalyptic number.

It is an amenable number.

122512040221 is a deficient number, since it is larger than the sum of its proper divisors (386473631).

122512040221 is an equidigital number, since it uses as much as digits as its factorization.

122512040221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386473630.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 122512040221 its reverse (122040215221), we get a palindrome (244552255442).

The spelling of 122512040221 in words is "one hundred twenty-two billion, five hundred twelve million, forty thousand, two hundred twenty-one".