20010121002 has 12 divisors (see below), whose sum is σ = 43355262210. Its totient is φ = 6670040328.

The previous prime is 20010120983. The next prime is 20010121007. The reversal of 20010121002 is 20012101002.

It can be written as a sum of positive squares in only one way, i.e., 19782141201 + 227979801 = 140649^2 + 15099^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20010121007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 555836677 + ... + 555836712.

Almost surely, 2^20010121002 is an apocalyptic number.

20010121002 is an abundant number, since it is smaller than the sum of its proper divisors (23345141208).

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

20010121002 is a wasteful number, since it uses less digits than its factorization.

20010121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111673397 (or 1111673394 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20010121002 its reverse (20012101002), we get a palindrome (40022222004).

The spelling of 20010121002 in words is "twenty billion, ten million, one hundred twenty-one thousand, two".