121220202000001 has 12 divisors (see below), whose sum is σ = 137777233644372. Its totient is φ = 106006330489824.

The previous prime is 121220201999989. The next prime is 121220202000061. The reversal of 121220202000001 is 100000202022121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 79241776186225 + 41978425813776 = 8901785^2 + 6479076^2 .

It is not a de Polignac number, because 121220202000001 - 2²¹ = 121220199902849 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121220202000061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12914996586 + ... + 12915005971.

It is an arithmetic number, because the mean of its divisors is an integer number (11481436137031).

Almost surely, 2^{121220202000001} is an apocalyptic number.

It is an amenable number.

121220202000001 is a deficient number, since it is larger than the sum of its proper divisors (16557031644371).

121220202000001 is a wasteful number, since it uses less digits than its factorization.

121220202000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25830002608 (or 25830002589 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121220202000001 its reverse (100000202022121), we get a palindrome (221220404022122).

The spelling of 121220202000001 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred two million, one", and thus it is an aban number.