1012121131 has 4 divisors (see below), whose sum is σ = 1156709872. Its totient is φ = 867532392.

The previous prime is 1012121113. The next prime is 1012121137. The reversal of 1012121131 is 1311212101.

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 1012121131 - 2²³ = 1003732523 is a prime.

It is a super-2 number, since 2×1012121131² = 2048778367633438322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012121137) 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, 72294360 + ... + 72294373.

It is an arithmetic number, because the mean of its divisors is an integer number (289177468).

Almost surely, 2^1012121131 is an apocalyptic number.

1012121131 is a deficient number, since it is larger than the sum of its proper divisors (144588741).

1012121131 is an equidigital number, since it uses as much as digits as its factorization.

1012121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144588740.

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

The square root of 1012121131 is about 31813.8512443872. The cubic root of 1012121131 is about 1004.0241614027.

Adding to 1012121131 its reverse (1311212101), we get a palindrome (2323333232).

The spelling of 1012121131 in words is "one billion, twelve million, one hundred twenty-one thousand, one hundred thirty-one".