51211020 has 48 divisors (see below), whose sum is σ = 163876608. Its totient is φ = 11705280.

The previous prime is 51211019. The next prime is 51211031. The reversal of 51211020 is 2011215.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 51210987 and 51211005.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60546 + ... + 61385.

It is an arithmetic number, because the mean of its divisors is an integer number (3414096).

Almost surely, 2^51211020 is an apocalyptic number.

It is an amenable number.

51211020 is an abundant number, since it is smaller than the sum of its proper divisors (112665588).

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

51211020 is a wasteful number, since it uses less digits than its factorization.

51211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121950 (or 121948 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 51211020 is about 7156.1875324784. The cubic root of 51211020 is about 371.3537455638.

Adding to 51211020 its reverse (2011215), we get a palindrome (53222235).

The spelling of 51211020 in words is "fifty-one million, two hundred eleven thousand, twenty".