1253223521 has 8 divisors (see below), whose sum is σ = 1370244384. Its totient is φ = 1136717920.

The previous prime is 1253223509. The next prime is 1253223533.

It is a happy number.

1253223521 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (1253223509) and next prime (1253223533).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1253223521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1253223541) 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, 123716 + ... + 133461.

It is an arithmetic number, because the mean of its divisors is an integer number (171280548).

Almost surely, 2^1253223521 is an apocalyptic number.

1253223521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1253223521 is a deficient number, since it is larger than the sum of its proper divisors (117020863).

1253223521 is a wasteful number, since it uses less digits than its factorization.

1253223521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257631.

The product of its digits is 3600, while the sum is 26.

The square root of 1253223521 is about 35400.8971778965. The cubic root of 1253223521 is about 1078.1425322372.

The spelling of 1253223521 in words is "one billion, two hundred fifty-three million, two hundred twenty-three thousand, five hundred twenty-one".