20021121030312 has 24 divisors (see below), whose sum is σ = 54223869457290. Its totient is φ = 6673707010080.

The previous prime is 20021121030307. The next prime is 20021121030341. The reversal of 20021121030312 is 21303012112002.

20021121030312 is a `hidden beast` number, since 200 + 2 + 1 + 121 + 0 + 30 + 312 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13155955968996 + 6865165061316 = 3627114^2 + 2620146^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139035562639 + ... + 139035562782.

Almost surely, 2^{20021121030312} is an apocalyptic number.

It is an amenable number.

20021121030312 is an abundant number, since it is smaller than the sum of its proper divisors (34202748426978).

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

20021121030312 is a wasteful number, since it uses less digits than its factorization.

20021121030312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278071125433 (or 278071125426 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20021121030312 its reverse (21303012112002), we get a palindrome (41324133142314).

The spelling of 20021121030312 in words is "twenty trillion, twenty-one billion, one hundred twenty-one million, thirty thousand, three hundred twelve".