1211121030 has 64 divisors (see below), whose sum is σ = 3330915840. Its totient is φ = 276079104.

The previous prime is 1211121029. The next prime is 1211121061. The reversal of 1211121030 is 301211121.

It is a junction number, because it is equal to n+sod(n) for n = 1211120997 and 1211121015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71982 + ... + 87198.

It is an arithmetic number, because the mean of its divisors is an integer number (52045560).

Almost surely, 2^1211121030 is an apocalyptic number.

1211121030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211121030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1665457920).

1211121030 is an abundant number, since it is smaller than the sum of its proper divisors (2119794810).

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

1211121030 is a wasteful number, since it uses less digits than its factorization.

1211121030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15613.

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

The square root of 1211121030 is about 34801.1642046642. The cubic root of 1211121030 is about 1065.9312184066.

Adding to 1211121030 its reverse (301211121), we get a palindrome (1512332151).

Subtracting from 1211121030 its reverse (301211121), we obtain a palindrome (909909909).

The spelling of 1211121030 in words is "one billion, two hundred eleven million, one hundred twenty-one thousand, thirty".