210111021000 has 192 divisors, whose sum is σ = 717499626480. Its totient is φ = 55451750400.

The previous prime is 210111020909. The next prime is 210111021007. The reversal of 210111021000 is 120111012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 21965018436 + 188146002564 = 148206^2 + 433758^2 .

It is a super-2 number, since 2×210111021000² (a number of 23 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (210111021007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 752662 + ... + 993338.

Almost surely, 2^210111021000 is an apocalyptic number.

210111021000 is a gapful number since it is divisible by the number (20) 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 210111021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358749813240).

210111021000 is an abundant number, since it is smaller than the sum of its proper divisors (507388605480).

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

210111021000 is a wasteful number, since it uses less digits than its factorization.

210111021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240801 (or 240784 counting only the distinct ones).

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

Adding to 210111021000 its reverse (120111012), we get a palindrome (210231132012).

The spelling of 210111021000 in words is "two hundred ten billion, one hundred eleven million, twenty-one thousand".