21011012109999 has 12 divisors (see below), whose sum is σ = 30349313084376. Its totient is φ = 14007307543632.

The previous prime is 21011012109947. The next prime is 21011012110051. The reversal of 21011012109999 is 99990121011012.

It is an interprime number because it is at equal distance from previous prime (21011012109947) and next prime (21011012110051).

It is not a de Polignac number, because 21011012109999 - 2²¹ = 21011010012847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21015012109999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1447732 + ... + 6642134.

It is an arithmetic number, because the mean of its divisors is an integer number (2529109423698).

Almost surely, 2^{21011012109999} is an apocalyptic number.

21011012109999 is a deficient number, since it is larger than the sum of its proper divisors (9338300974377).

21011012109999 is a wasteful number, since it uses less digits than its factorization.

21011012109999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5643846 (or 5643843 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 45.

The spelling of 21011012109999 in words is "twenty-one trillion, eleven billion, twelve million, one hundred nine thousand, nine hundred ninety-nine".