21010111031200 has 72 divisors (see below), whose sum is σ = 52160271528960. Its totient is φ = 8261602963200.

The previous prime is 21010111031177. The next prime is 21010111031209. The reversal of 21010111031200 is 213011101012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21010111031209) 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, 222517536 + ... + 222611935.

It is an arithmetic number, because the mean of its divisors is an integer number (724448215680).

Almost surely, 2^{21010111031200} is an apocalyptic number.

21010111031200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010111031200 is an abundant number, since it is smaller than the sum of its proper divisors (31150160497760).

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

21010111031200 is a wasteful number, since it uses less digits than its factorization.

21010111031200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445129550 (or 445129537 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21010111031200 its reverse (213011101012), we get a palindrome (21223122132212).

The spelling of 21010111031200 in words is "twenty-one trillion, ten billion, one hundred eleven million, thirty-one thousand, two hundred".