1221401403430 has 32 divisors (see below), whose sum is σ = 2367724068864. Its totient is φ = 450962898816.

The previous prime is 1221401403419. The next prime is 1221401403437. The reversal of 1221401403430 is 343041041221.

It is a junction number, because it is equal to n+sod(n) for n = 1221401403395 and 1221401403404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221401403437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3864027 + ... + 4168153.

It is an arithmetic number, because the mean of its divisors is an integer number (73991377152).

Almost surely, 2^{1221401403430} is an apocalyptic number.

1221401403430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221401403430 is a deficient number, since it is larger than the sum of its proper divisors (1146322665434).

1221401403430 is a wasteful number, since it uses less digits than its factorization.

1221401403430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335040.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 1221401403430 its reverse (343041041221), we get a palindrome (1564442444651).

The spelling of 1221401403430 in words is "one trillion, two hundred twenty-one billion, four hundred one million, four hundred three thousand, four hundred thirty".