1021211101100 has 72 divisors (see below), whose sum is σ = 2298162283200. Its totient is φ = 393414784000.

The previous prime is 1021211101061. The next prime is 1021211101103. The reversal of 1021211101100 is 11011121201.

It is a super-2 number, since 2×1021211101100² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1021211101103) 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 23 ways as a sum of consecutive naturals, for example, 723821 + ... + 1601979.

It is an arithmetic number, because the mean of its divisors is an integer number (31918920600).

Almost surely, 2^{1021211101100} is an apocalyptic number.

1021211101100 is a gapful number since it is divisible by the number (10) 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 1021211101100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149081141600).

1021211101100 is an abundant number, since it is smaller than the sum of its proper divisors (1276951182100).

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

1021211101100 is a wasteful number, since it uses less digits than its factorization.

1021211101100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878603 (or 878596 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1021211101100 its reverse (11011121201), we get a palindrome (1032222222301).

The spelling of 1021211101100 in words is "one trillion, twenty-one billion, two hundred eleven million, one hundred one thousand, one hundred".