65121020 has 12 divisors (see below), whose sum is σ = 136754184. Its totient is φ = 26048400.

The previous prime is 65120969. The next prime is 65121031. The reversal of 65121020 is 2012156.

It is a self number, because there is not a number n which added to its sum of digits gives 65121020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1628006 + ... + 1628045.

It is an arithmetic number, because the mean of its divisors is an integer number (11396182).

Almost surely, 2^65121020 is an apocalyptic number.

It is an amenable number.

65121020 is an abundant number, since it is smaller than the sum of its proper divisors (71633164).

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

65121020 is a wasteful number, since it uses less digits than its factorization.

65121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3256060 (or 3256058 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 65121020 is about 8069.7595998890. The cubic root of 65121020 is about 402.3219535815.

Adding to 65121020 its reverse (2012156), we get a palindrome (67133176).

The spelling of 65121020 in words is "sixty-five million, one hundred twenty-one thousand, twenty".