121222220231421 has 20 divisors (see below), whose sum is σ = 183266792577792. Its totient is φ = 79841141031528.

The previous prime is 121222220231419. The next prime is 121222220231447. The reversal of 121222220231421 is 124132022222121.

121222220231421 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 2 + 2 + 2 + 2 + 0 + 231 + 421 = 666.

It is not a de Polignac number, because 121222220231421 - 2¹ = 121222220231419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222220431421) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9015478941 + ... + 9015492386.

Almost surely, 2^{121222220231421} is an apocalyptic number.

It is an amenable number.

121222220231421 is a deficient number, since it is larger than the sum of its proper divisors (62044572346371).

121222220231421 is an equidigital number, since it uses as much as digits as its factorization.

121222220231421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18030971422 (or 18030971413 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 121222220231421 its reverse (124132022222121), we get a palindrome (245354242453542).

The spelling of 121222220231421 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, two hundred twenty million, two hundred thirty-one thousand, four hundred twenty-one".