2021010100021 has 16 divisors (see below), whose sum is σ = 2282208753600. Its totient is φ = 1772803468800.

The previous prime is 2021010100009. The next prime is 2021010100033. The reversal of 2021010100021 is 1200010101202.

It is an interprime number because it is at equal distance from previous prime (2021010100009) and next prime (2021010100033).

It is a cyclic number.

It is not a de Polignac number, because 2021010100021 - 2¹¹ = 2021010097973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021010099980 and 2021010100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021010100051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1502460 + ... + 2509861.

It is an arithmetic number, because the mean of its divisors is an integer number (142638047100).

Almost surely, 2^{2021010100021} is an apocalyptic number.

It is an amenable number.

2021010100021 is a deficient number, since it is larger than the sum of its proper divisors (261198653579).

2021010100021 is a wasteful number, since it uses less digits than its factorization.

2021010100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013940.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2021010100021 its reverse (1200010101202), we get a palindrome (3221020201223).

The spelling of 2021010100021 in words is "two trillion, twenty-one billion, ten million, one hundred thousand, twenty-one".