2421221465531 has 4 divisors (see below), whose sum is σ = 2641332507864. Its totient is φ = 2201110423200.

The previous prime is 2421221465441. The next prime is 2421221465603. The reversal of 2421221465531 is 1355641221242.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2421221465531 is a prime.

It is a super-2 number, since 2×2421221465531² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2421221465231) 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, 110055521150 + ... + 110055521171.

It is an arithmetic number, because the mean of its divisors is an integer number (660333126966).

Almost surely, 2^{2421221465531} is an apocalyptic number.

2421221465531 is a deficient number, since it is larger than the sum of its proper divisors (220111042333).

2421221465531 is a wasteful number, since it uses less digits than its factorization.

2421221465531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220111042332.

The product of its digits is 115200, while the sum is 38.

Adding to 2421221465531 its reverse (1355641221242), we get a palindrome (3776862686773).

The spelling of 2421221465531 in words is "two trillion, four hundred twenty-one billion, two hundred twenty-one million, four hundred sixty-five thousand, five hundred thirty-one".