21010033020311 has 4 divisors (see below), whose sum is σ = 21498638439432. Its totient is φ = 20521427601192.

The previous prime is 21010033020299. The next prime is 21010033020329. The reversal of 21010033020311 is 11302033001012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21010033020311 - 2¹⁸ = 21010032758167 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 21010033020311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010033220311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244302709496 + ... + 244302709581.

It is an arithmetic number, because the mean of its divisors is an integer number (5374659609858).

Almost surely, 2^{21010033020311} is an apocalyptic number.

21010033020311 is a deficient number, since it is larger than the sum of its proper divisors (488605419121).

21010033020311 is an equidigital number, since it uses as much as digits as its factorization.

21010033020311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488605419120.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21010033020311 its reverse (11302033001012), we get a palindrome (32312066021323).

The spelling of 21010033020311 in words is "twenty-one trillion, ten billion, thirty-three million, twenty thousand, three hundred eleven".