21020201111999 has 8 divisors (see below), whose sum is σ = 21023823291408. Its totient is φ = 21016579267840.

The previous prime is 21020201111951. The next prime is 21020201112007. The reversal of 21020201111999 is 99911110202012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21020201111999 - 2³⁶ = 20951481635263 is a prime.

It is a super-2 number, since 2×21020201111999² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020201110999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146525984 + ... + 146669370.

It is an arithmetic number, because the mean of its divisors is an integer number (2627977911426).

Almost surely, 2^{21020201111999} is an apocalyptic number.

21020201111999 is a deficient number, since it is larger than the sum of its proper divisors (3622179409).

21020201111999 is a wasteful number, since it uses less digits than its factorization.

21020201111999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167625.

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 21020201111999 in words is "twenty-one trillion, twenty billion, two hundred one million, one hundred eleven thousand, nine hundred ninety-nine".