122121111022221 has 16 divisors (see below), whose sum is σ = 173358795250368. Its totient is φ = 76201668230400.

The previous prime is 122121111022219. The next prime is 122121111022277. The reversal of 122121111022221 is 122220111121221.

It is not a de Polignac number, because 122121111022221 - 2¹ = 122121111022219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122121111072221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6614718915 + ... + 6614737376.

It is an arithmetic number, because the mean of its divisors is an integer number (10834924703148).

Almost surely, 2^{122121111022221} is an apocalyptic number.

It is an amenable number.

122121111022221 is a deficient number, since it is larger than the sum of its proper divisors (51237684228147).

122121111022221 is a wasteful number, since it uses less digits than its factorization.

122121111022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13229456492.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 122121111022221 its reverse (122220111121221), we get a palindrome (244341222143442).

The spelling of 122121111022221 in words is "one hundred twenty-two trillion, one hundred twenty-one billion, one hundred eleven million, twenty-two thousand, two hundred twenty-one".