1211111201002 has 4 divisors (see below), whose sum is σ = 1816666801506. Its totient is φ = 605555600500.

The previous prime is 1211111200979. The next prime is 1211111201009. The reversal of 1211111201002 is 2001021111121.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 639198651001 + 571912550001 = 799499^2 + 756249^2 .

It is not an unprimeable number, because it can be changed into a prime (1211111201009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302777800249 + ... + 302777800252.

Almost surely, 2^{1211111201002} is an apocalyptic number.

1211111201002 is a deficient number, since it is larger than the sum of its proper divisors (605555600504).

1211111201002 is an equidigital number, since it uses as much as digits as its factorization.

1211111201002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605555600503.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1211111201002 its reverse (2001021111121), we get a palindrome (3212132312123).

The spelling of 1211111201002 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two hundred one thousand, two".