121101221020 has 24 divisors (see below), whose sum is σ = 273875069664. Its totient is φ = 44714296896.

The previous prime is 121101221009. The next prime is 121101221107. The reversal of 121101221020 is 20122101121.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232886704 + ... + 232887223.

It is an arithmetic number, because the mean of its divisors is an integer number (11411461236).

Almost surely, 2^121101221020 is an apocalyptic number.

121101221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121101221020 is an abundant number, since it is smaller than the sum of its proper divisors (152773848644).

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

121101221020 is a wasteful number, since it uses less digits than its factorization.

121101221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465773949 (or 465773947 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121101221020 its reverse (20122101121), we get a palindrome (141223322141).

The spelling of 121101221020 in words is "one hundred twenty-one billion, one hundred one million, two hundred twenty-one thousand, twenty".