1211800142 has 8 divisors (see below), whose sum is σ = 2077371696. Its totient is φ = 519342912.

The previous prime is 1211800133. The next prime is 1211800153. The reversal of 1211800142 is 2410081121.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43278563 + ... + 43278590.

It is an arithmetic number, because the mean of its divisors is an integer number (259671462).

Almost surely, 2^1211800142 is an apocalyptic number.

1211800142 is a deficient number, since it is larger than the sum of its proper divisors (865571554).

1211800142 is an equidigital number, since it uses as much as digits as its factorization.

1211800142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86557162.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1211800142 is about 34810.9198671911. The cubic root of 1211800142 is about 1066.1304144143.

Adding to 1211800142 its reverse (2410081121), we get a palindrome (3621881263).

The spelling of 1211800142 in words is "one billion, two hundred eleven million, eight hundred thousand, one hundred forty-two".