20001021012 has 96 divisors (see below), whose sum is σ = 59288042240. Its totient is φ = 5712094080.

The previous prime is 20001020993. The next prime is 20001021013. The reversal of 20001021012 is 21012010002.

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

It is a junction number, because it is equal to n+sod(n) for n = 20001020985 and 20001021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001021013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2400678 + ... + 2408994.

Almost surely, 2^20001021012 is an apocalyptic number.

It is an amenable number.

20001021012 is an abundant number, since it is smaller than the sum of its proper divisors (39287021228).

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

20001021012 is a wasteful number, since it uses less digits than its factorization.

20001021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11518 (or 11510 counting only the distinct ones).

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

Adding to 20001021012 its reverse (21012010002), we get a palindrome (41013031014).

The spelling of 20001021012 in words is "twenty billion, one million, twenty-one thousand, twelve".