210022100021 has 16 divisors (see below), whose sum is σ = 212352368640. Its totient is φ = 207703485360.

The previous prime is 210022099957. The next prime is 210022100023. The reversal of 210022100021 is 120001220012.

It is a happy number.

210022100021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 210022100021 - 2⁶ = 210022099957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210022099975 and 210022100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210022100023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89484170 + ... + 89486516.

It is an arithmetic number, because the mean of its divisors is an integer number (13272023040).

Almost surely, 2^210022100021 is an apocalyptic number.

It is an amenable number.

210022100021 is a deficient number, since it is larger than the sum of its proper divisors (2330268619).

210022100021 is a wasteful number, since it uses less digits than its factorization.

210022100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4424.

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

Adding to 210022100021 its reverse (120001220012), we get a palindrome (330023320033).

The spelling of 210022100021 in words is "two hundred ten billion, twenty-two million, one hundred thousand, twenty-one".