1211230421011 has 8 divisors (see below), whose sum is σ = 1307807746560. Its totient is φ = 1115139631872.

The previous prime is 1211230420919. The next prime is 1211230421021. The reversal of 1211230421011 is 1101240321121.

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 1211230421011 - 2¹¹ = 1211230418963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211230421011.

It is not an unprimeable number, because it can be changed into a prime (1211230421021) 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, 121628926 + ... + 121638883.

It is an arithmetic number, because the mean of its divisors is an integer number (163475968320).

Almost surely, 2^{1211230421011} is an apocalyptic number.

1211230421011 is a deficient number, since it is larger than the sum of its proper divisors (96577325549).

1211230421011 is a wasteful number, since it uses less digits than its factorization.

1211230421011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243268205.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1211230421011 its reverse (1101240321121), we get a palindrome (2312470742132).

The spelling of 1211230421011 in words is "one trillion, two hundred eleven billion, two hundred thirty million, four hundred twenty-one thousand, eleven".