1211021131 has 8 divisors (see below), whose sum is σ = 1227292560. Its totient is φ = 1194809088.

The previous prime is 1211021117. The next prime is 1211021143. The reversal of 1211021131 is 1311201121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211021131 - 2²¹ = 1208923979 is a prime.

It is a super-2 number, since 2×1211021131² = 2933144359457038322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211021111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26995 + ... + 56131.

It is an arithmetic number, because the mean of its divisors is an integer number (153411570).

Almost surely, 2^1211021131 is an apocalyptic number.

1211021131 is a deficient number, since it is larger than the sum of its proper divisors (16271429).

1211021131 is an equidigital number, since it uses as much as digits as its factorization.

1211021131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29693.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1211021131 is about 34799.7288926221. The cubic root of 1211021131 is about 1065.9019099152.

Adding to 1211021131 its reverse (1311201121), we get a palindrome (2522222252).

The spelling of 1211021131 in words is "one billion, two hundred eleven million, twenty-one thousand, one hundred thirty-one".