145520215212 has 12 divisors (see below), whose sum is σ = 339547168856. Its totient is φ = 48506738400.

The previous prime is 145520215207. The next prime is 145520215213. The reversal of 145520215212 is 212512025541.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×145520215212² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145520215212.

It is not an unprimeable number, because it can be changed into a prime (145520215213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6063342289 + ... + 6063342312.

Almost surely, 2^145520215212 is an apocalyptic number.

145520215212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

145520215212 is an abundant number, since it is smaller than the sum of its proper divisors (194026953644).

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

145520215212 is a wasteful number, since it uses less digits than its factorization.

145520215212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12126684608 (or 12126684606 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The spelling of 145520215212 in words is "one hundred forty-five billion, five hundred twenty million, two hundred fifteen thousand, two hundred twelve".