42254253621 has 6 divisors (see below), whose sum is σ = 61033921910. Its totient is φ = 28169502408.

The previous prime is 42254253617. The next prime is 42254253659. The reversal of 42254253621 is 12635245224.

42254253621 is a `hidden beast` number, since 4 + 2 + 2 + 5 + 4 + 25 + 3 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 38783394225 + 3470859396 = 196935^2 + 58914^2 .

It is not a de Polignac number, because 42254253621 - 2² = 42254253617 is a prime.

It is a super-2 number, since 2×42254253621² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42254253611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2347458526 + ... + 2347458543.

Almost surely, 2^42254253621 is an apocalyptic number.

It is an amenable number.

42254253621 is a deficient number, since it is larger than the sum of its proper divisors (18779668289).

42254253621 is a wasteful number, since it uses less digits than its factorization.

42254253621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4694917075 (or 4694917072 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 42254253621 its reverse (12635245224), we get a palindrome (54889498845).

The spelling of 42254253621 in words is "forty-two billion, two hundred fifty-four million, two hundred fifty-three thousand, six hundred twenty-one".