51201001212 has 24 divisors (see below), whose sum is σ = 119494440912. Its totient is φ = 17063366400.

The previous prime is 51201001211. The next prime is 51201001213. The reversal of 51201001212 is 21210010215.

It is an interprime number because it is at equal distance from previous prime (51201001211) and next prime (51201001213).

It is a super-2 number, since 2×51201001212² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51201001191 and 51201001200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51201001211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395239 + ... + 508542.

It is an arithmetic number, because the mean of its divisors is an integer number (4978935038).

Almost surely, 2^51201001212 is an apocalyptic number.

It is an amenable number.

51201001212 is an abundant number, since it is smaller than the sum of its proper divisors (68293439700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51201001212 is a wasteful number, since it uses less digits than its factorization.

51201001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908509 (or 908507 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 51201001212 its reverse (21210010215), we get a palindrome (72411011427).

The spelling of 51201001212 in words is "fifty-one billion, two hundred one million, one thousand, two hundred twelve".