21010033021211 has 24 divisors (see below), whose sum is σ = 23408580780144. Its totient is φ = 18834835443840.

The previous prime is 21010033021199. The next prime is 21010033021249. The reversal of 21010033021211 is 11212033001012.

It is not a de Polignac number, because 21010033021211 - 2²² = 21010028826907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010033021211.

It is not an unprimeable number, because it can be changed into a prime (21010033021811) 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, 277520 + ... + 6488226.

It is an arithmetic number, because the mean of its divisors is an integer number (975357532506).

Almost surely, 2^{21010033021211} is an apocalyptic number.

21010033021211 is a deficient number, since it is larger than the sum of its proper divisors (2398547758933).

21010033021211 is a wasteful number, since it uses less digits than its factorization.

21010033021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6211311 (or 6211298 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21010033021211 its reverse (11212033001012), we get a palindrome (32222066022223).

The spelling of 21010033021211 in words is "twenty-one trillion, ten billion, thirty-three million, twenty-one thousand, two hundred eleven".