20111211000 has 96 divisors (see below), whose sum is σ = 67975923600. Its totient is φ = 5362987200.

The previous prime is 20111210941. The next prime is 20111211011. The reversal of 20111211000 is 11211102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1108290 + ... + 1126289.

Almost surely, 2^20111211000 is an apocalyptic number.

20111211000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111211000 is an abundant number, since it is smaller than the sum of its proper divisors (47864712600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111211000 is a wasteful number, since it uses less digits than its factorization.

20111211000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234606 (or 2234589 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20111211000 its reverse (11211102), we get a palindrome (20122422102).

The spelling of 20111211000 in words is "twenty billion, one hundred eleven million, two hundred eleven thousand".