1225421001 has 16 divisors (see below), whose sum is σ = 2074787200. Its totient is φ = 700240464.

The previous prime is 1225420993. The next prime is 1225421027. The reversal of 1225421001 is 1001245221.

1225421001 is a `hidden beast` number, since 1 + 22 + 542 + 100 + 1 = 666.

It is not a de Polignac number, because 1225421001 - 2³ = 1225420993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1225421101) 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, 3241666 + ... + 3242043.

It is an arithmetic number, because the mean of its divisors is an integer number (129674200).

Almost surely, 2^1225421001 is an apocalyptic number.

It is an amenable number.

1225421001 is a deficient number, since it is larger than the sum of its proper divisors (849366199).

1225421001 is an equidigital number, since it uses as much as digits as its factorization.

1225421001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6483725 (or 6483719 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1225421001 is about 35006.0137833487. The cubic root of 1225421001 is about 1070.1100422534.

Adding to 1225421001 its reverse (1001245221), we get a palindrome (2226666222).

The spelling of 1225421001 in words is "one billion, two hundred twenty-five million, four hundred twenty-one thousand, one".