121222200020 has 24 divisors (see below), whose sum is σ = 254787454824. Its totient is φ = 48446816256.

The previous prime is 121222200007. The next prime is 121222200053. The reversal of 121222200020 is 20002222121.

It can be written as a sum of positive squares in 4 ways, for example, as 49112764996 + 72109435024 = 221614^2 + 268532^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121222199968 and 121222200004.

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, 2605349 + ... + 2651468.

It is an arithmetic number, because the mean of its divisors is an integer number (10616143951).

Almost surely, 2^121222200020 is an apocalyptic number.

121222200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121222200020 is an abundant number, since it is smaller than the sum of its proper divisors (133565254804).

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

121222200020 is a wasteful number, since it uses less digits than its factorization.

121222200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257979 (or 5257977 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 121222200020 its reverse (20002222121), we get a palindrome (141224422141).

The spelling of 121222200020 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred thousand, twenty".