21210001020213 has 16 divisors (see below), whose sum is σ = 28668284494080. Its totient is φ = 13945871084544.

The previous prime is 21210001020209. The next prime is 21210001020233. The reversal of 21210001020213 is 31202010001212.

It is not a de Polignac number, because 21210001020213 - 2² = 21210001020209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210001020192 and 21210001020201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210001020233) 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, 5685445 + ... + 8645477.

It is an arithmetic number, because the mean of its divisors is an integer number (1791767780880).

Almost surely, 2^{21210001020213} is an apocalyptic number.

It is an amenable number.

21210001020213 is a deficient number, since it is larger than the sum of its proper divisors (7458283473867).

21210001020213 is a wasteful number, since it uses less digits than its factorization.

21210001020213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992828.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21210001020213 its reverse (31202010001212), we get a palindrome (52412011021425).

The spelling of 21210001020213 in words is "twenty-one trillion, two hundred ten billion, one million, twenty thousand, two hundred thirteen".