1211021211021 has 8 divisors (see below), whose sum is σ = 1614768729024. Its totient is φ = 807310583520.

The previous prime is 1211021211017. The next prime is 1211021211119. The reversal of 1211021211021 is 1201121201121.

It is a happy number.

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

It is not a de Polignac number, because 1211021211021 - 2² = 1211021211017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211021213021) 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, 9145936 + ... + 9277401.

It is an arithmetic number, because the mean of its divisors is an integer number (201846091128).

Almost surely, 2^{1211021211021} is an apocalyptic number.

It is an amenable number.

1211021211021 is a deficient number, since it is larger than the sum of its proper divisors (403747518003).

1211021211021 is a wasteful number, since it uses less digits than its factorization.

1211021211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18445251.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211021211021 its reverse (1201121201121), we get a palindrome (2412142412142).

The spelling of 1211021211021 in words is "one trillion, two hundred eleven billion, twenty-one million, two hundred eleven thousand, twenty-one".