1220000405421 has 8 divisors (see below), whose sum is σ = 1859048236864. Its totient is φ = 697143088800.

The previous prime is 1220000405411. The next prime is 1220000405431. The reversal of 1220000405421 is 1245040000221.

It is an interprime number because it is at equal distance from previous prime (1220000405411) and next prime (1220000405431).

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

It is not a de Polignac number, because 1220000405421 - 2⁶ = 1220000405357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 58095257401 = 1220000405421 / (1 + 2 + 2 + 0 + 0 + 0 + 0 + 4 + 0 + 5 + 4 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220000405411) 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, 29047628680 + ... + 29047628721.

It is an arithmetic number, because the mean of its divisors is an integer number (232381029608).

Almost surely, 2^{1220000405421} is an apocalyptic number.

It is an amenable number.

1220000405421 is a deficient number, since it is larger than the sum of its proper divisors (639047831443).

1220000405421 is an equidigital number, since it uses as much as digits as its factorization.

1220000405421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58095257411.

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 1220000405421 its reverse (1245040000221), we get a palindrome (2465040405642).

The spelling of 1220000405421 in words is "one trillion, two hundred twenty billion, four hundred five thousand, four hundred twenty-one".