1211000012121 has 8 divisors (see below), whose sum is σ = 1614673803520. Its totient is φ = 807329781072.

The previous prime is 1211000012107. The next prime is 1211000012147. The reversal of 1211000012121 is 1212100001121.

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

It is not a de Polignac number, because 1211000012121 - 2¹³ = 1211000003929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211000012097 and 1211000012106.

It is not an unprimeable number, because it can be changed into a prime (1211000012021) 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, 43431 + ... + 1556883.

It is an arithmetic number, because the mean of its divisors is an integer number (201834225440).

Almost surely, 2^{1211000012121} is an apocalyptic number.

It is an amenable number.

1211000012121 is a deficient number, since it is larger than the sum of its proper divisors (403673791399).

1211000012121 is a wasteful number, since it uses less digits than its factorization.

1211000012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780175.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1211000012121 its reverse (1212100001121), we get a palindrome (2423100013242).

It can be divided in two parts, 12110000 and 12121, that added together give a palindrome (12122121).

The spelling of 1211000012121 in words is "one trillion, two hundred eleven billion, twelve thousand, one hundred twenty-one".