1245995421 has 16 divisors (see below), whose sum is σ = 1813002048. Its totient is φ = 754880000.

The previous prime is 1245995417. The next prime is 1245995423.

1245995421 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1245995421 - 2² = 1245995417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245995423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127315 + ... + 136751.

It is an arithmetic number, because the mean of its divisors is an integer number (113312628).

Almost surely, 2^1245995421 is an apocalyptic number.

1245995421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1245995421 is a deficient number, since it is larger than the sum of its proper divisors (567006627).

1245995421 is a wasteful number, since it uses less digits than its factorization.

1245995421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13452.

The product of its digits is 129600, while the sum is 42.

The square root of 1245995421 is about 35298.6603286867. The cubic root of 1245995421 is about 1076.0657671943.

It can be divided in two parts, 12459 and 95421, that added together give a triangular number (107880 = T₄₆₄).

The spelling of 1245995421 in words is "one billion, two hundred forty-five million, nine hundred ninety-five thousand, four hundred twenty-one".