1211130021 has 16 divisors (see below), whose sum is σ = 1686577536. Its totient is φ = 771614976.

The previous prime is 1211130007. The next prime is 1211130023. The reversal of 1211130021 is 1200311121.

It is not a de Polignac number, because 1211130021 - 2⁶ = 1211129957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211129979 and 1211130006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211130023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74961 + ... + 89673.

It is an arithmetic number, because the mean of its divisors is an integer number (105411096).

Almost surely, 2^1211130021 is an apocalyptic number.

It is an amenable number.

1211130021 is a deficient number, since it is larger than the sum of its proper divisors (475447515).

1211130021 is a wasteful number, since it uses less digits than its factorization.

1211130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15932.

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

The square root of 1211130021 is about 34801.2933811374. The cubic root of 1211130021 is about 1065.9338561182.

Adding to 1211130021 its reverse (1200311121), we get a palindrome (2411441142).

The spelling of 1211130021 in words is "one billion, two hundred eleven million, one hundred thirty thousand, twenty-one".