212004205521 has 16 divisors (see below), whose sum is σ = 294474640320. Its totient is φ = 135551809280.

The previous prime is 212004205513. The next prime is 212004205537. The reversal of 212004205521 is 125502400212.

It is a cyclic number.

It is not a de Polignac number, because 212004205521 - 2³ = 212004205513 is a prime.

It is a super-3 number, since 3×212004205521³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212004205491 and 212004205500.

It is not an unprimeable number, because it can be changed into a prime (212004205321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14599620 + ... + 14614133.

It is an arithmetic number, because the mean of its divisors is an integer number (18404665020).

Almost surely, 2^212004205521 is an apocalyptic number.

It is an amenable number.

212004205521 is a deficient number, since it is larger than the sum of its proper divisors (82470434799).

212004205521 is a wasteful number, since it uses less digits than its factorization.

212004205521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29213856.

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 212004205521 its reverse (125502400212), we get a palindrome (337506605733).

The spelling of 212004205521 in words is "two hundred twelve billion, four million, two hundred five thousand, five hundred twenty-one".