1221423022452 has 24 divisors (see below), whose sum is σ = 2878204748832. Its totient is φ = 403109908000.

The previous prime is 1221423022451. The next prime is 1221423022459. The reversal of 1221423022452 is 2542203241221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221423022451) 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, 503886174 + ... + 503888597.

It is an arithmetic number, because the mean of its divisors is an integer number (119925197868).

Almost surely, 2^{1221423022452} is an apocalyptic number.

1221423022452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221423022452 is an abundant number, since it is smaller than the sum of its proper divisors (1656781726380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221423022452 is a wasteful number, since it uses less digits than its factorization.

1221423022452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007774879 (or 1007774877 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 1221423022452 its reverse (2542203241221), we get a palindrome (3763626263673).

The spelling of 1221423022452 in words is "one trillion, two hundred twenty-one billion, four hundred twenty-three million, twenty-two thousand, four hundred fifty-two".