1021636211112 has 144 divisors (see below), whose sum is σ = 3046973578740. Its totient is φ = 309013056000.

The previous prime is 1021636211107. The next prime is 1021636211231. The reversal of 1021636211112 is 2111126361201.

1021636211112 is a `hidden beast` number, since 1 + 0 + 2 + 1 + 636 + 2 + 1 + 11 + 12 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 946289255076 + 75346956036 = 972774^2 + 274494^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4604812 + ... + 4821572.

Almost surely, 2^{1021636211112} is an apocalyptic number.

1021636211112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021636211112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1523486789370).

1021636211112 is an abundant number, since it is smaller than the sum of its proper divisors (2025337367628).

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

1021636211112 is a wasteful number, since it uses less digits than its factorization.

1021636211112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217336 (or 217318 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The spelling of 1021636211112 in words is "one trillion, twenty-one billion, six hundred thirty-six million, two hundred eleven thousand, one hundred twelve".