18950021 has 16 divisors (see below), whose sum is σ = 20528640. Its totient is φ = 17451840.

The previous prime is 18950003. The next prime is 18950023. The reversal of 18950021 is 12005981.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18950021 - 2¹⁰ = 18948997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18950023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96095 + ... + 96291.

It is an arithmetic number, because the mean of its divisors is an integer number (1283040).

Almost surely, 2^18950021 is an apocalyptic number.

It is an amenable number.

18950021 is a deficient number, since it is larger than the sum of its proper divisors (1578619).

18950021 is a wasteful number, since it uses less digits than its factorization.

18950021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 18950021 is about 4353.1621839761. The cubic root of 18950021 is about 266.6059874089.

The spelling of 18950021 in words is "eighteen million, nine hundred fifty thousand, twenty-one".