1225123621 has 8 divisors (see below), whose sum is σ = 1262639840. Its totient is φ = 1188017712.

The previous prime is 1225123607. The next prime is 1225123631. The reversal of 1225123621 is 1263215221.

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

It is a cyclic number.

It is not a de Polignac number, because 1225123621 - 2²⁵ = 1191569189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225123631) 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, 96510 + ... + 108463.

It is an arithmetic number, because the mean of its divisors is an integer number (157829980).

Almost surely, 2^1225123621 is an apocalyptic number.

It is an amenable number.

1225123621 is a deficient number, since it is larger than the sum of its proper divisors (37516219).

1225123621 is a wasteful number, since it uses less digits than its factorization.

1225123621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205155.

The product of its digits is 1440, while the sum is 25.

The square root of 1225123621 is about 35001.7659697336. The cubic root of 1225123621 is about 1070.0234719863.

Adding to 1225123621 its reverse (1263215221), we get a palindrome (2488338842).

The spelling of 1225123621 in words is "one billion, two hundred twenty-five million, one hundred twenty-three thousand, six hundred twenty-one".