1243220223421 has 12 divisors (see below), whose sum is σ = 1366607988256. Its totient is φ = 1130123122920.

The previous prime is 1243220223379. The next prime is 1243220223437.

1243220223421 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-1243220223421 is a prime.

It is a super-2 number, since 2×1243220223421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243220223421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243220223521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1470070 + ... + 2155816.

Almost surely, 2^{1243220223421} is an apocalyptic number.

1243220223421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1243220223421 is a deficient number, since it is larger than the sum of its proper divisors (123387764835).

1243220223421 is a wasteful number, since it uses less digits than its factorization.

1243220223421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700752 (or 700741 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

It can be divided in two parts, 1243220 and 223421, that added together give a palindrome (1466641).

The spelling of 1243220223421 in words is "one trillion, two hundred forty-three billion, two hundred twenty million, two hundred twenty-three thousand, four hundred twenty-one".