51212535000 has 160 divisors (see below), whose sum is σ = 174532881600. Its totient is φ = 12415120000.

The previous prime is 51212534993. The next prime is 51212535013. The reversal of 51212535000 is 53521215.

It is a happy number.

It is a super-2 number, since 2×51212535000² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9811 + ... + 320189.

It is an arithmetic number, because the mean of its divisors is an integer number (1090830510).

Almost surely, 2^51212535000 is an apocalyptic number.

51212535000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51212535000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87266440800).

51212535000 is an abundant number, since it is smaller than the sum of its proper divisors (123320346600).

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

51212535000 is a wasteful number, since it uses less digits than its factorization.

51212535000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310419 (or 310400 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The spelling of 51212535000 in words is "fifty-one billion, two hundred twelve million, five hundred thirty-five thousand".