210011001221021 has 24 divisors (see below), whose sum is σ = 287008041638304. Its totient is φ = 151056864010080.

The previous prime is 210011001220987. The next prime is 210011001221029. The reversal of 210011001221021 is 120122100110012.

It is not a de Polignac number, because 210011001221021 - 2⁶ = 210011001220957 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210011001220987 and 210011001221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210011001221029) 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, 14985792995 + ... + 14985807008.

It is an arithmetic number, because the mean of its divisors is an integer number (11958668401596).

Almost surely, 2^{210011001221021} is an apocalyptic number.

It is an amenable number.

210011001221021 is a deficient number, since it is larger than the sum of its proper divisors (76997040417283).

210011001221021 is a wasteful number, since it uses less digits than its factorization.

210011001221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29971600041 (or 29971600034 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210011001221021 its reverse (120122100110012), we get a palindrome (330133101331033).

The spelling of 210011001221021 in words is "two hundred ten trillion, eleven billion, one million, two hundred twenty-one thousand, twenty-one".