121220120220220 has 96 divisors (see below), whose sum is σ = 306243450616320. Its totient is φ = 39373348734720.

The previous prime is 121220120220149. The next prime is 121220120220247. The reversal of 121220120220220 is 22022021022121.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 366800455 + ... + 367130785.

It is an arithmetic number, because the mean of its divisors is an integer number (3190035943920).

Almost surely, 2^{121220120220220} is an apocalyptic number.

121220120220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220120220220 is an abundant number, since it is smaller than the sum of its proper divisors (185023330396100).

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

121220120220220 is a wasteful number, since it uses less digits than its factorization.

121220120220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468323 (or 468321 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 121220120220220 its reverse (22022021022121), we get a palindrome (143242141242341).

The spelling of 121220120220220 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred twenty million, two hundred twenty thousand, two hundred twenty".