51220102 has 4 divisors (see below), whose sum is σ = 76830156. Its totient is φ = 25610050.

The previous prime is 51220087. The next prime is 51220109. The reversal of 51220102 is 20102215.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51220109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12805024 + ... + 12805027.

It is an arithmetic number, because the mean of its divisors is an integer number (19207539).

Almost surely, 2^51220102 is an apocalyptic number.

51220102 is a deficient number, since it is larger than the sum of its proper divisors (25610054).

51220102 is a wasteful number, since it uses less digits than its factorization.

51220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25610053.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 51220102 is about 7156.8220601046. The cubic root of 51220102 is about 371.3756967986.

Adding to 51220102 its reverse (20102215), we get a palindrome (71322317).

The spelling of 51220102 in words is "fifty-one million, two hundred twenty thousand, one hundred two".