1252105221 has 8 divisors (see below), whose sum is σ = 1723327744. Its totient is φ = 807809760.

The previous prime is 1252105219. The next prime is 1252105229. The reversal of 1252105221 is 1225012521.

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

It is not a de Polignac number, because 1252105221 - 2¹ = 1252105219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252105229) 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, 6731656 + ... + 6731841.

It is an arithmetic number, because the mean of its divisors is an integer number (215415968).

Almost surely, 2^1252105221 is an apocalyptic number.

It is an amenable number.

1252105221 is a deficient number, since it is larger than the sum of its proper divisors (471222523).

1252105221 is a wasteful number, since it uses less digits than its factorization.

1252105221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13463531.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1252105221 is about 35385.0988553091. The cubic root of 1252105221 is about 1077.8217473231.

Adding to 1252105221 its reverse (1225012521), we get a palindrome (2477117742).

The spelling of 1252105221 in words is "one billion, two hundred fifty-two million, one hundred five thousand, two hundred twenty-one".