121211001020 has 24 divisors (see below), whose sum is σ = 254562182784. Its totient is φ = 48480766016.

The previous prime is 121211000971. The next prime is 121211001031. The reversal of 121211001020 is 20100112121.

It is a junction number, because it is equal to n+sod(n) for n = 121211000992 and 121211001010.

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, 54869 + ... + 495411.

It is an arithmetic number, because the mean of its divisors is an integer number (10606757616).

Almost surely, 2^121211001020 is an apocalyptic number.

121211001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211001020 is an abundant number, since it is smaller than the sum of its proper divisors (133351181764).

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

121211001020 is a wasteful number, since it uses less digits than its factorization.

121211001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454309 (or 454307 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121211001020 its reverse (20100112121), we get a palindrome (141311113141).

The spelling of 121211001020 in words is "one hundred twenty-one billion, two hundred eleven million, one thousand, twenty".