365220021 has 8 divisors (see below), whose sum is σ = 502668544. Its totient is φ = 235625760.

The previous prime is 365220019. The next prime is 365220049. The reversal of 365220021 is 120022563.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 365220021 - 2¹ = 365220019 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 365220021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (365220001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1963456 + ... + 1963641.

It is an arithmetic number, because the mean of its divisors is an integer number (62833568).

Almost surely, 2^365220021 is an apocalyptic number.

365220021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

365220021 is a deficient number, since it is larger than the sum of its proper divisors (137448523).

365220021 is a wasteful number, since it uses less digits than its factorization.

365220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927131.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 365220021 is about 19110.7305197891. The cubic root of 365220021 is about 714.8005187882.

Adding to 365220021 its reverse (120022563), we get a palindrome (485242584).

The spelling of 365220021 in words is "three hundred sixty-five million, two hundred twenty thousand, twenty-one".