2405213522021 has 4 divisors (see below), whose sum is σ = 2421142088544. Its totient is φ = 2389284955500.

The previous prime is 2405213521993. The next prime is 2405213522051. The reversal of 2405213522021 is 1202253125042.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2405213522021 - 2²⁶ = 2405146413157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2405213522051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7964283035 + ... + 7964283336.

It is an arithmetic number, because the mean of its divisors is an integer number (605285522136).

Almost surely, 2^{2405213522021} is an apocalyptic number.

It is an amenable number.

2405213522021 is a deficient number, since it is larger than the sum of its proper divisors (15928566523).

2405213522021 is a wasteful number, since it uses less digits than its factorization.

2405213522021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15928566522.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 2405213522021 its reverse (1202253125042), we get a palindrome (3607466647063).

The spelling of 2405213522021 in words is "two trillion, four hundred five billion, two hundred thirteen million, five hundred twenty-two thousand, twenty-one".