400212101534251 has 2 divisors, whose sum is σ = 400212101534252. Its totient is φ = 400212101534250.

The previous prime is 400212101534243. The next prime is 400212101534279. The reversal of 400212101534251 is 152435101212004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400212101534251 - 2³ = 400212101534243 is a prime.

It is a super-2 number, since 2×400212101534251² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400212101534351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200106050767125 + 200106050767126.

It is an arithmetic number, because the mean of its divisors is an integer number (200106050767126).

Almost surely, 2^{400212101534251} is an apocalyptic number.

400212101534251 is a deficient number, since it is larger than the sum of its proper divisors (1).

400212101534251 is an equidigital number, since it uses as much as digits as its factorization.

400212101534251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 400212101534251 its reverse (152435101212004), we get a palindrome (552647202746255).

The spelling of 400212101534251 in words is "four hundred trillion, two hundred twelve billion, one hundred one million, five hundred thirty-four thousand, two hundred fifty-one".