1201211221001 has 4 divisors (see below), whose sum is σ = 1310412241104. Its totient is φ = 1092010200900.

The previous prime is 1201211220959. The next prime is 1201211221003. The reversal of 1201211221001 is 1001221121021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201211221001 - 2³⁸ = 926333314057 is a prime.

It is a super-4 number, since 4×1201211221001⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201211221003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54600510035 + ... + 54600510056.

It is an arithmetic number, because the mean of its divisors is an integer number (327603060276).

Almost surely, 2^{1201211221001} is an apocalyptic number.

1201211221001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201211221001 is a deficient number, since it is larger than the sum of its proper divisors (109201020103).

1201211221001 is a wasteful number, since it uses less digits than its factorization.

1201211221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109201020102.

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

Adding to 1201211221001 its reverse (1001221121021), we get a palindrome (2202432342022).

It can be divided in two parts, 120 and 1211221001, that added together give a palindrome (1211221121).

The spelling of 1201211221001 in words is "one trillion, two hundred one billion, two hundred eleven million, two hundred twenty-one thousand, one".