1211311230 has 16 divisors (see below), whose sum is σ = 2907147024. Its totient is φ = 323016320.

The previous prime is 1211311219. The next prime is 1211311259. The reversal of 1211311230 is 321131121.

It is a happy number.

It is a super-2 number, since 2×1211311230² = 2934549791848225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20188491 + ... + 20188550.

It is an arithmetic number, because the mean of its divisors is an integer number (181696689).

Almost surely, 2^1211311230 is an apocalyptic number.

1211311230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211311230 is an abundant number, since it is smaller than the sum of its proper divisors (1695835794).

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

1211311230 is a wasteful number, since it uses less digits than its factorization.

1211311230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40377051.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1211311230 is about 34803.8967645866. The cubic root of 1211311230 is about 1065.9870150612.

Adding to 1211311230 its reverse (321131121), we get a palindrome (1532442351).

The spelling of 1211311230 in words is "one billion, two hundred eleven million, three hundred eleven thousand, two hundred thirty".