212421451251 has 4 divisors (see below), whose sum is σ = 283228601672. Its totient is φ = 141614300832.

The previous prime is 212421451247. The next prime is 212421451267. The reversal of 212421451251 is 152154124212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 212421451251 - 2² = 212421451247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212421451271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35403575206 + ... + 35403575211.

It is an arithmetic number, because the mean of its divisors is an integer number (70807150418).

Almost surely, 2^212421451251 is an apocalyptic number.

212421451251 is a deficient number, since it is larger than the sum of its proper divisors (70807150421).

212421451251 is an equidigital number, since it uses as much as digits as its factorization.

212421451251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70807150420.

The product of its digits is 6400, while the sum is 30.

Adding to 212421451251 its reverse (152154124212), we get a palindrome (364575575463).

The spelling of 212421451251 in words is "two hundred twelve billion, four hundred twenty-one million, four hundred fifty-one thousand, two hundred fifty-one".