210001022021 has 32 divisors (see below), whose sum is σ = 243140491776. Its totient is φ = 177666048000.

The previous prime is 210001021987. The next prime is 210001022039. The reversal of 210001022021 is 120220100012.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-210001022021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210001021993 and 210001022011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001028021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154298381 + ... + 154299741.

It is an arithmetic number, because the mean of its divisors is an integer number (7598140368).

Almost surely, 2^210001022021 is an apocalyptic number.

It is an amenable number.

210001022021 is a deficient number, since it is larger than the sum of its proper divisors (33139469755).

210001022021 is a wasteful number, since it uses less digits than its factorization.

210001022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373.

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

Adding to 210001022021 its reverse (120220100012), we get a palindrome (330221122033).

The spelling of 210001022021 in words is "two hundred ten billion, one million, twenty-two thousand, twenty-one".