1221434012001 has 16 divisors (see below), whose sum is σ = 1861853080448. Its totient is φ = 697729680000.

The previous prime is 1221434011999. The next prime is 1221434012009. The reversal of 1221434012001 is 1002104341221.

It is not a de Polignac number, because 1221434012001 - 2¹ = 1221434011999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221434012009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9627670 + ... + 9753711.

It is an arithmetic number, because the mean of its divisors is an integer number (116365817528).

Almost surely, 2^{1221434012001} is an apocalyptic number.

It is an amenable number.

1221434012001 is a deficient number, since it is larger than the sum of its proper divisors (640419068447).

1221434012001 is a wasteful number, since it uses less digits than its factorization.

1221434012001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19384392.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1221434012001 its reverse (1002104341221), we get a palindrome (2223538353222).

The spelling of 1221434012001 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-four million, twelve thousand, one".