1012211100 has 72 divisors (see below), whose sum is σ = 3254079920. Its totient is φ = 269922240.

The previous prime is 1012211051. The next prime is 1012211107. The reversal of 1012211100 is 11122101.

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 not an unprimeable number, because it can be changed into a prime (1012211107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 184747 + ... + 190146.

Almost surely, 2^1012211100 is an apocalyptic number.

1012211100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012211100 is an abundant number, since it is smaller than the sum of its proper divisors (2241868820).

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

1012211100 is a wasteful number, since it uses less digits than its factorization.

1012211100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374916 (or 374903 counting only the distinct ones).

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

The square root of 1012211100 is about 31815.2652039866. The cubic root of 1012211100 is about 1004.0539102706.

Adding to 1012211100 its reverse (11122101), we get a palindrome (1023333201).

The spelling of 1012211100 in words is "one billion, twelve million, two hundred eleven thousand, one hundred".