20002010100021 has 24 divisors (see below), whose sum is σ = 30746595446424. Its totient is φ = 12486573818880.

The previous prime is 20002010099891. The next prime is 20002010100047. The reversal of 20002010100021 is 12000101020002.

It can be written as a sum of positive squares in 4 ways, for example, as 16777920519396 + 3224089580625 = 4096086^2 + 1795575^2 .

It is not a de Polignac number, because 20002010100021 - 2¹³ = 20002010091829 is a prime.

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 = 20002010099976 and 20002010100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002010100071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 331777200 + ... + 331837481.

It is an arithmetic number, because the mean of its divisors is an integer number (1281108143601).

Almost surely, 2^{20002010100021} is an apocalyptic number.

It is an amenable number.

20002010100021 is a deficient number, since it is larger than the sum of its proper divisors (10744585346403).

20002010100021 is a wasteful number, since it uses less digits than its factorization.

20002010100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663614901 (or 663614898 counting only the distinct ones).

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

Adding to 20002010100021 its reverse (12000101020002), we get a palindrome (32002111120023).

The spelling of 20002010100021 in words is "twenty trillion, two billion, ten million, one hundred thousand, twenty-one".