121201011021020 has 48 divisors (see below), whose sum is σ = 292489511740608. Its totient is φ = 41325048737280.

The previous prime is 121201011021019. The next prime is 121201011021029. The reversal of 121201011021020 is 20120110102121.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 121201011020986 and 121201011021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201011021029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2391470537 + ... + 2391521216.

It is an arithmetic number, because the mean of its divisors is an integer number (6093531494596).

Almost surely, 2^{121201011021020} is an apocalyptic number.

121201011021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121201011021020 is an abundant number, since it is smaller than the sum of its proper divisors (171288500719588).

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

121201011021020 is a wasteful number, since it uses less digits than its factorization.

121201011021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782991950 (or 4782991948 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121201011021020 its reverse (20120110102121), we get a palindrome (141321121123141).

The spelling of 121201011021020 in words is "one hundred twenty-one trillion, two hundred one billion, eleven million, twenty-one thousand, twenty".