121010021802 has 12 divisors (see below), whose sum is σ = 262188380610. Its totient is φ = 40336673928.

The previous prime is 121010021801. The next prime is 121010021813. The reversal of 121010021802 is 208120010121.

It can be written as a sum of positive squares in only one way, i.e., 111455154801 + 9554867001 = 333849^2 + 97749^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 6722778989 = 121010021802 / (1 + 2 + 1 + 0 + 1 + 0 + 0 + 2 + 1 + 8 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (121010021801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3361389477 + ... + 3361389512.

Almost surely, 2^121010021802 is an apocalyptic number.

121010021802 is an abundant number, since it is smaller than the sum of its proper divisors (141178358808).

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

121010021802 is a wasteful number, since it uses less digits than its factorization.

121010021802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6722778997 (or 6722778994 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121010021802 its reverse (208120010121), we get a palindrome (329130031923).

The spelling of 121010021802 in words is "one hundred twenty-one billion, ten million, twenty-one thousand, eight hundred two".