201210001020021 has 24 divisors (see below), whose sum is σ = 315170727020064. Its totient is φ = 113838755872800.

The previous prime is 201210001020013. The next prime is 201210001020043. The reversal of 201210001020021 is 120020100012102.

It is not a de Polignac number, because 201210001020021 - 2³ = 201210001020013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201210001019979 and 201210001020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201210001021021) 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, 6776101575 + ... + 6776131268.

It is an arithmetic number, because the mean of its divisors is an integer number (13132113625836).

Almost surely, 2^{201210001020021} is an apocalyptic number.

201210001020021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201210001020021 is a deficient number, since it is larger than the sum of its proper divisors (113960726000043).

201210001020021 is a wasteful number, since it uses less digits than its factorization.

201210001020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13552232961 (or 13552232954 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201210001020021 its reverse (120020100012102), we get a palindrome (321230101032123).

The spelling of 201210001020021 in words is "two hundred one trillion, two hundred ten billion, one million, twenty thousand, twenty-one".