121011021211020 has 192 divisors, whose sum is σ = 350389887160320. Its totient is φ = 31185032140800.

The previous prime is 121011021211009. The next prime is 121011021211021. The reversal of 121011021211020 is 20112120110121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (121011021211021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114807561 + ... + 115856799.

It is an arithmetic number, because the mean of its divisors is an integer number (1824947328960).

Almost surely, 2^{121011021211020} is an apocalyptic number.

121011021211020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121011021211020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175194943580160).

121011021211020 is an abundant number, since it is smaller than the sum of its proper divisors (229378865949300).

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

121011021211020 is a wasteful number, since it uses less digits than its factorization.

121011021211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049736 (or 1049734 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121011021211020 its reverse (20112120110121), we get a palindrome (141123141321141).

The spelling of 121011021211020 in words is "one hundred twenty-one trillion, eleven billion, twenty-one million, two hundred eleven thousand, twenty".