2220523042621 has 4 divisors (see below), whose sum is σ = 2391332507452. Its totient is φ = 2049713577792.

The previous prime is 2220523042613. The next prime is 2220523042631. The reversal of 2220523042621 is 1262403250222.

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

It can be written as a sum of positive squares in 2 ways, for example, as 306212823225 + 1914310219396 = 553365^2 + 1383586^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220523042621 - 2³ = 2220523042613 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 (2220523042631) 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, 85404732396 + ... + 85404732421.

It is an arithmetic number, because the mean of its divisors is an integer number (597833126863).

Almost surely, 2^{2220523042621} is an apocalyptic number.

It is an amenable number.

2220523042621 is a deficient number, since it is larger than the sum of its proper divisors (170809464831).

2220523042621 is a wasteful number, since it uses less digits than its factorization.

2220523042621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170809464830.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 2220523042621 its reverse (1262403250222), we get a palindrome (3482926292843).

The spelling of 2220523042621 in words is "two trillion, two hundred twenty billion, five hundred twenty-three million, forty-two thousand, six hundred twenty-one".