1211321203013 has 8 divisors (see below), whose sum is σ = 1275088171200. Its totient is φ = 1147555556928.

The previous prime is 1211321203009. The next prime is 1211321203069. The reversal of 1211321203013 is 3103021231121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1211321203013 - 2² = 1211321203009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211321203093) 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, 1955645 + ... + 2499437.

It is an arithmetic number, because the mean of its divisors is an integer number (159386021400).

Almost surely, 2^{1211321203013} is an apocalyptic number.

It is an amenable number.

1211321203013 is a deficient number, since it is larger than the sum of its proper divisors (63766968187).

1211321203013 is a wasteful number, since it uses less digits than its factorization.

1211321203013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661051.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1211321203013 its reverse (3103021231121), we get a palindrome (4314342434134).

The spelling of 1211321203013 in words is "one trillion, two hundred eleven billion, three hundred twenty-one million, two hundred three thousand, thirteen".