1021211120 has 20 divisors (see below), whose sum is σ = 2374316040. Its totient is φ = 408484416.

The previous prime is 1021211033. The next prime is 1021211129. The reversal of 1021211120 is 211121201.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1021211120² = 2085744303223308800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021211129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6382490 + ... + 6382649.

It is an arithmetic number, because the mean of its divisors is an integer number (118715802).

Almost surely, 2^1021211120 is an apocalyptic number.

1021211120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021211120 is an abundant number, since it is smaller than the sum of its proper divisors (1353104920).

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

1021211120 is a wasteful number, since it uses less digits than its factorization.

1021211120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12765152 (or 12765146 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1021211120 is about 31956.3940393781. The cubic root of 1021211120 is about 1007.0209640337.

Adding to 1021211120 its reverse (211121201), we get a palindrome (1232332321).

The spelling of 1021211120 in words is "one billion, twenty-one million, two hundred eleven thousand, one hundred twenty".