1211012142 has 16 divisors (see below), whose sum is σ = 2449239120. Its totient is φ = 399134912.

The previous prime is 1211012137. The next prime is 1211012161. The reversal of 1211012142 is 2412101121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1133373 + ... + 1134440.

It is an arithmetic number, because the mean of its divisors is an integer number (153077445).

Almost surely, 2^1211012142 is an apocalyptic number.

1211012142 is an abundant number, since it is smaller than the sum of its proper divisors (1238226978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211012142 is a wasteful number, since it uses less digits than its factorization.

1211012142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267907.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1211012142 is about 34799.5997390775. The cubic root of 1211012142 is about 1065.8992726323.

Adding to 1211012142 its reverse (2412101121), we get a palindrome (3623113263).

The spelling of 1211012142 in words is "one billion, two hundred eleven million, twelve thousand, one hundred forty-two".