121222221020 has 24 divisors (see below), whose sum is σ = 255154596144. Its totient is φ = 48376901376.

The previous prime is 121222220969. The next prime is 121222221041. The reversal of 121222221020 is 20122222121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121222221020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6990314 + ... + 7007633.

It is an arithmetic number, because the mean of its divisors is an integer number (10631441506).

Almost surely, 2^121222221020 is an apocalyptic number.

121222221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121222221020 is an abundant number, since it is smaller than the sum of its proper divisors (133932375124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121222221020 is a wasteful number, since it uses less digits than its factorization.

121222221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13998389 (or 13998387 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 121222221020 its reverse (20122222121), we get a palindrome (141344443141).

The spelling of 121222221020 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty".