521403212512 has 96 divisors (see below), whose sum is σ = 1289184120000. Its totient is φ = 206269346304.

The previous prime is 521403212471. The next prime is 521403212563. The reversal of 521403212512 is 215212304125.

It is a happy number.

It is a super-2 number, since 2×521403212512² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

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, 1684387 + ... + 1969762.

It is an arithmetic number, because the mean of its divisors is an integer number (13429001250).

Almost surely, 2^521403212512 is an apocalyptic number.

521403212512 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

521403212512 is an abundant number, since it is smaller than the sum of its proper divisors (767780907488).

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

521403212512 is a wasteful number, since it uses less digits than its factorization.

521403212512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3654193 (or 3654171 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 521403212512 its reverse (215212304125), we get a palindrome (736615516637).

The spelling of 521403212512 in words is "five hundred twenty-one billion, four hundred three million, two hundred twelve thousand, five hundred twelve".