55212121311012 has 72 divisors (see below), whose sum is σ = 139658697523800. Its totient is φ = 18391551897600.

The previous prime is 55212121310981. The next prime is 55212121311019. The reversal of 55212121311012 is 21011312121255.

55212121311012 is a `hidden beast` number, since 5 + 5 + 212 + 121 + 311 + 0 + 12 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 419911776036 + 54792209534976 = 648006^2 + 7402176^2 .

It is not an unprimeable number, because it can be changed into a prime (55212121311019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 573685648 + ... + 573781880.

It is an arithmetic number, because the mean of its divisors is an integer number (1939704132275).

Almost surely, 2^{55212121311012} is an apocalyptic number.

It is an amenable number.

55212121311012 is an abundant number, since it is smaller than the sum of its proper divisors (84446576212788).

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

55212121311012 is a wasteful number, since it uses less digits than its factorization.

55212121311012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106893 (or 106888 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

Adding to 55212121311012 its reverse (21011312121255), we get a palindrome (76223433432267).

The spelling of 55212121311012 in words is "fifty-five trillion, two hundred twelve billion, one hundred twenty-one million, three hundred eleven thousand, twelve".