1252142221 has 8 divisors (see below), whose sum is σ = 1371017088. Its totient is φ = 1134108000.

The previous prime is 1252142219. The next prime is 1252142231. The reversal of 1252142221 is 1222412521.

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

It is a cyclic number.

It is not a de Polignac number, because 1252142221 - 2¹ = 1252142219 is a prime.

It is a super-2 number, since 2×1252142221² = 3135720283221625682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1252142192 and 1252142201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252142231) 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 7 ways as a sum of consecutive naturals, for example, 207040 + ... + 213001.

It is an arithmetic number, because the mean of its divisors is an integer number (171377136).

Almost surely, 2^1252142221 is an apocalyptic number.

1252142221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1252142221 is a deficient number, since it is larger than the sum of its proper divisors (118874867).

1252142221 is a wasteful number, since it uses less digits than its factorization.

1252142221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420323.

The product of its digits is 640, while the sum is 22.

The square root of 1252142221 is about 35385.6216703904. The cubic root of 1252142221 is about 1077.8323638461.

Adding to 1252142221 its reverse (1222412521), we get a palindrome (2474554742).

The spelling of 1252142221 in words is "one billion, two hundred fifty-two million, one hundred forty-two thousand, two hundred twenty-one".