1021211131 has 8 divisors (see below), whose sum is σ = 1083731184. Its totient is φ = 958963200.

The previous prime is 1021211129. The next prime is 1021211153. The reversal of 1021211131 is 1311121201.

It is a happy number.

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

It is not a de Polignac number, because 1021211131 - 2¹ = 1021211129 is a prime.

It is a super-2 number, since 2×1021211131² = 2085744348156598322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021212131) 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, 60270 + ... + 75331.

It is an arithmetic number, because the mean of its divisors is an integer number (135466398).

Almost surely, 2^1021211131 is an apocalyptic number.

1021211131 is a deficient number, since it is larger than the sum of its proper divisors (62520053).

1021211131 is a wasteful number, since it uses less digits than its factorization.

1021211131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136061.

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

The square root of 1021211131 is about 31956.3942114876. The cubic root of 1021211131 is about 1007.0209676494.

Adding to 1021211131 its reverse (1311121201), we get a palindrome (2332332332).

The spelling of 1021211131 in words is "one billion, twenty-one million, two hundred eleven thousand, one hundred thirty-one".