1211003021131 has 4 divisors (see below), whose sum is σ = 1212594353064. Its totient is φ = 1209411689200.

The previous prime is 1211003021057. The next prime is 1211003021167. The reversal of 1211003021131 is 1311203001121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211003021131 - 2¹⁷ = 1211002890059 is a prime.

It is a super-2 number, since 2×1211003021131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211003021531) 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, 795664825 + ... + 795666346.

It is an arithmetic number, because the mean of its divisors is an integer number (303148588266).

Almost surely, 2^{1211003021131} is an apocalyptic number.

1211003021131 is a deficient number, since it is larger than the sum of its proper divisors (1591331933).

1211003021131 is an equidigital number, since it uses as much as digits as its factorization.

1211003021131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591331932.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1211003021131 its reverse (1311203001121), we get a palindrome (2522206022252).

The spelling of 1211003021131 in words is "one trillion, two hundred eleven billion, three million, twenty-one thousand, one hundred thirty-one".