1221431402401 has 8 divisors (see below), whose sum is σ = 1422259746624. Its totient is φ = 1027187594160.

The previous prime is 1221431402363. The next prime is 1221431402417. The reversal of 1221431402401 is 1042041341221.

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

It is not a de Polignac number, because 1221431402401 - 2¹⁵ = 1221431369633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221431402201) 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, 1646133595 + ... + 1646134336.

It is an arithmetic number, because the mean of its divisors is an integer number (177782468328).

Almost surely, 2^{1221431402401} is an apocalyptic number.

It is an amenable number.

1221431402401 is a deficient number, since it is larger than the sum of its proper divisors (200828344223).

1221431402401 is an equidigital number, since it uses as much as digits as its factorization.

1221431402401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3292267991.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 1221431402401 its reverse (1042041341221), we get a palindrome (2263472743622).

The spelling of 1221431402401 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-one million, four hundred two thousand, four hundred one".