251201201212 has 12 divisors (see below), whose sum is σ = 473417648536. Its totient is φ = 115939015920.

The previous prime is 251201201203. The next prime is 251201201213. The reversal of 251201201212 is 212102102152.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 251201201212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251201201213) 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, 2415396114 + ... + 2415396217.

Almost surely, 2^251201201212 is an apocalyptic number.

It is an amenable number.

251201201212 is a deficient number, since it is larger than the sum of its proper divisors (222216447324).

251201201212 is a wasteful number, since it uses less digits than its factorization.

251201201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4830792348 (or 4830792346 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 251201201212 its reverse (212102102152), we get a palindrome (463303303364).

The spelling of 251201201212 in words is "two hundred fifty-one billion, two hundred one million, two hundred one thousand, two hundred twelve".