201621023 has 16 divisors (see below), whose sum is σ = 213987840. Its totient is φ = 189737856.

The previous prime is 201621001. The next prime is 201621031. The reversal of 201621023 is 320126102.

201621023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 201621023 - 2¹⁴ = 201604639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201620992 and 201621010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201621073) 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, 134663 + ... + 136151.

It is an arithmetic number, because the mean of its divisors is an integer number (13374240).

Almost surely, 2^201621023 is an apocalyptic number.

201621023 is a deficient number, since it is larger than the sum of its proper divisors (12366817).

201621023 is a wasteful number, since it uses less digits than its factorization.

201621023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 201621023 is about 14199.3317800522. The cubic root of 201621023 is about 586.3792648250.

Adding to 201621023 its reverse (320126102), we get a palindrome (521747125).

The spelling of 201621023 in words is "two hundred one million, six hundred twenty-one thousand, twenty-three".