10218621 has 8 divisors (see below), whose sum is σ = 15571264. Its totient is φ = 5839200.

The previous prime is 10218617. The next prime is 10218629. The reversal of 10218621 is 12681201.

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

It is not a de Polignac number, because 10218621 - 2² = 10218617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 486601 = 10218621 / (1 + 0 + 2 + 1 + 8 + 6 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10218629) 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, 243280 + ... + 243321.

It is an arithmetic number, because the mean of its divisors is an integer number (1946408).

Almost surely, 2^10218621 is an apocalyptic number.

It is an amenable number.

10218621 is a deficient number, since it is larger than the sum of its proper divisors (5352643).

10218621 is an equidigital number, since it uses as much as digits as its factorization.

10218621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486611.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 10218621 is about 3196.6577858757. The cubic root of 10218621 is about 217.0021802467.

Adding to 10218621 its reverse (12681201), we get a palindrome (22899822).

The spelling of 10218621 in words is "ten million, two hundred eighteen thousand, six hundred twenty-one".