1225421421 has 16 divisors (see below), whose sum is σ = 1977151104. Its totient is φ = 659049984.

The previous prime is 1225421399. The next prime is 1225421423. The reversal of 1225421421 is 1241245221.

It is not a de Polignac number, because 1225421421 - 2⁹ = 1225420909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1225421391 and 1225421400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225421423) 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, 1715920 + ... + 1716633.

It is an arithmetic number, because the mean of its divisors is an integer number (123571944).

Almost surely, 2^1225421421 is an apocalyptic number.

It is an amenable number.

1225421421 is a deficient number, since it is larger than the sum of its proper divisors (751729683).

1225421421 is a wasteful number, since it uses less digits than its factorization.

1225421421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432580.

The product of its digits is 1280, while the sum is 24.

The square root of 1225421421 is about 35006.0197823174. The cubic root of 1225421421 is about 1070.1101645097.

Adding to 1225421421 its reverse (1241245221), we get a palindrome (2466666642).

The spelling of 1225421421 in words is "one billion, two hundred twenty-five million, four hundred twenty-one thousand, four hundred twenty-one".