21210001020212 has 24 divisors (see below), whose sum is σ = 39311170221960. Its totient is φ = 9978564638720.

The previous prime is 21210001020209. The next prime is 21210001020233. The reversal of 21210001020212 is 21202010001212.

It can be written as a sum of positive squares in 4 ways, for example, as 6766626423076 + 14443374597136 = 2601274^2 + 3800444^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40555637 + ... + 41075292.

It is an arithmetic number, because the mean of its divisors is an integer number (1637965425915).

Almost surely, 2^{21210001020212} is an apocalyptic number.

It is an amenable number.

21210001020212 is a deficient number, since it is larger than the sum of its proper divisors (18101169201748).

21210001020212 is a wasteful number, since it uses less digits than its factorization.

21210001020212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81634771 (or 81634769 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210001020212 its reverse (21202010001212), we get a palindrome (42412011021424).

The spelling of 21210001020212 in words is "twenty-one trillion, two hundred ten billion, one million, twenty thousand, two hundred twelve".