20010202100021 has 12 divisors (see below), whose sum is σ = 23284838573388. Its totient is φ = 17145954124992.

The previous prime is 20010202099957. The next prime is 20010202100033. The reversal of 20010202100021 is 12000120201002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17213661634225 + 2796540465796 = 4148935^2 + 1672286^2 .

It is not a de Polignac number, because 20010202100021 - 2⁶ = 20010202099957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20010202099975 and 20010202100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010202100041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67083896 + ... + 67381521.

It is an arithmetic number, because the mean of its divisors is an integer number (1940403214449).

Almost surely, 2^{20010202100021} is an apocalyptic number.

It is an amenable number.

20010202100021 is a deficient number, since it is larger than the sum of its proper divisors (3274636473367).

20010202100021 is a wasteful number, since it uses less digits than its factorization.

20010202100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134468468 (or 134468461 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20010202100021 its reverse (12000120201002), we get a palindrome (32010322301023).

The spelling of 20010202100021 in words is "twenty trillion, ten billion, two hundred two million, one hundred thousand, twenty-one".