1251421000154 has 32 divisors (see below), whose sum is σ = 2138007466560. Its totient is φ = 544586716800.

The previous prime is 1251421000139. The next prime is 1251421000157. The reversal of 1251421000154 is 4510001241521.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

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 15 ways as a sum of consecutive naturals, for example, 5898707 + ... + 6107174.

It is an arithmetic number, because the mean of its divisors is an integer number (66812733330).

Almost surely, 2^{1251421000154} is an apocalyptic number.

1251421000154 is a deficient number, since it is larger than the sum of its proper divisors (886586466406).

1251421000154 is a wasteful number, since it uses less digits than its factorization.

1251421000154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12006126.

The product of its (nonzero) digits is 1600, while the sum is 26.

Adding to 1251421000154 its reverse (4510001241521), we get a palindrome (5761422241675).

The spelling of 1251421000154 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-one million, one hundred fifty-four", and thus it is an aban number.