1221422153445 has 112 divisors (see below), whose sum is σ = 2376775805040. Its totient is φ = 598729356288.

The previous prime is 1221422153401. The next prime is 1221422153449. The reversal of 1221422153445 is 5443512241221.

1221422153445 is a `hidden beast` number, since 1 + 2 + 2 + 142 + 21 + 53 + 445 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 436225904676 + 785196248769 = 660474^2 + 886113^2 .

It is not a de Polignac number, because 1221422153445 - 2⁹ = 1221422152933 is a prime.

It is a super-2 number, since 2×1221422153445² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221422153449) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 10985391 + ... + 11096019.

It is an arithmetic number, because the mean of its divisors is an integer number (21221212545).

Almost surely, 2^{1221422153445} is an apocalyptic number.

1221422153445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221422153445 is a deficient number, since it is larger than the sum of its proper divisors (1155353651595).

1221422153445 is a wasteful number, since it uses less digits than its factorization.

1221422153445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110898 (or 110883 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

Adding to 1221422153445 its reverse (5443512241221), we get a palindrome (6664934394666).

The spelling of 1221422153445 in words is "one trillion, two hundred twenty-one billion, four hundred twenty-two million, one hundred fifty-three thousand, four hundred forty-five".