11211021999 has 28 divisors (see below), whose sum is σ = 16835688856. Its totient is φ = 7462078992.

The previous prime is 11211021961. The next prime is 11211022003. The reversal of 11211021999 is 99912011211.

It is not a de Polignac number, because 11211021999 - 2²⁴ = 11194244783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211021929) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 456789 + ... + 480705.

It is an arithmetic number, because the mean of its divisors is an integer number (601274602).

Almost surely, 2^11211021999 is an apocalyptic number.

11211021999 is a deficient number, since it is larger than the sum of its proper divisors (5624666857).

11211021999 is an frugal number, since it uses more digits than its factorization.

11211021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24578 (or 24563 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 36.

The spelling of 11211021999 in words is "eleven billion, two hundred eleven million, twenty-one thousand, nine hundred ninety-nine".