1252553400121 has 16 divisors (see below), whose sum is σ = 1320675729408. Its totient is φ = 1186171520400.

The previous prime is 1252553400083. The next prime is 1252553400151. The reversal of 1252553400121 is 1210043552521.

It is a cyclic number.

It is not a de Polignac number, because 1252553400121 - 2⁹ = 1252553399609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252553400151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9684546 + ... + 9813028.

It is an arithmetic number, because the mean of its divisors is an integer number (82542233088).

Almost surely, 2^{1252553400121} is an apocalyptic number.

It is an amenable number.

1252553400121 is a deficient number, since it is larger than the sum of its proper divisors (68122329287).

1252553400121 is a wasteful number, since it uses less digits than its factorization.

1252553400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135252.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 1252553400121 its reverse (1210043552521), we get a palindrome (2462596952642).

The spelling of 1252553400121 in words is "one trillion, two hundred fifty-two billion, five hundred fifty-three million, four hundred thousand, one hundred twenty-one".