1251421014005 has 24 divisors (see below), whose sum is σ = 1585668547224. Its totient is φ = 947986790400.

The previous prime is 1251421013951. The next prime is 1251421014029. The reversal of 1251421014005 is 5004101241521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 173408114929 + 1078012899076 = 416423^2 + 1038274^2 .

It is not a de Polignac number, because 1251421014005 - 2³⁸ = 976543107061 is a prime.

It is a super-2 number, since 2×1251421014005² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3589625 + ... + 3922785.

It is an arithmetic number, because the mean of its divisors is an integer number (66069522801).

Almost surely, 2^{1251421014005} is an apocalyptic number.

It is an amenable number.

1251421014005 is a deficient number, since it is larger than the sum of its proper divisors (334247533219).

1251421014005 is a wasteful number, since it uses less digits than its factorization.

1251421014005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335285 (or 335266 counting only the distinct ones).

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

Adding to 1251421014005 its reverse (5004101241521), we get a palindrome (6255522255526).

The spelling of 1251421014005 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-one million, fourteen thousand, five".