1221012001211 has 8 divisors (see below), whose sum is σ = 1250364948624. Its totient is φ = 1191892942240.

The previous prime is 1221012001189. The next prime is 1221012001213. The reversal of 1221012001211 is 1121002101221.

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

It is not a de Polignac number, because 1221012001211 - 2³⁸ = 946134094267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221012001213) 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, 58461545 + ... + 58482426.

It is an arithmetic number, because the mean of its divisors is an integer number (156295618578).

Almost surely, 2^{1221012001211} is an apocalyptic number.

1221012001211 is a deficient number, since it is larger than the sum of its proper divisors (29352947413).

1221012001211 is a wasteful number, since it uses less digits than its factorization.

1221012001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116944221.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221012001211 its reverse (1121002101221), we get a palindrome (2342014102432).

The spelling of 1221012001211 in words is "one trillion, two hundred twenty-one billion, twelve million, one thousand, two hundred eleven".