1251421000153 has 8 divisors (see below), whose sum is σ = 1325093891688. Its totient is φ = 1177754763264.

The previous prime is 1251421000139. The next prime is 1251421000157. The reversal of 1251421000153 is 3510001241521.

It can be written as a sum of positive squares in 4 ways, for example, as 59247454464 + 1192173545689 = 243408^2 + 1091867^2 .

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 1251421000153 - 2⁵ = 1251421000121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251421000157) 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, 1273876 + ... + 2031157.

It is an arithmetic number, because the mean of its divisors is an integer number (165636736461).

Almost surely, 2^{1251421000153} is an apocalyptic number.

It is an amenable number.

1251421000153 is a deficient number, since it is larger than the sum of its proper divisors (73672891535).

1251421000153 is a wasteful number, since it uses less digits than its factorization.

1251421000153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327323.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 1251421000153 its reverse (3510001241521), we get a palindrome (4761422241674).

The spelling of 1251421000153 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-one million, one hundred fifty-three", and thus it is an aban number.