201321021 has 16 divisors (see below), whose sum is σ = 310056768. Its totient is φ = 114835200.

The previous prime is 201321013. The next prime is 201321023. The reversal of 201321021 is 120123102.

It is not a de Polignac number, because 201321021 - 2³ = 201321013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201320988 and 201321006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201321023) 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, 178870 + ... + 179991.

It is an arithmetic number, because the mean of its divisors is an integer number (19378548).

Almost surely, 2^201321021 is an apocalyptic number.

It is an amenable number.

201321021 is a deficient number, since it is larger than the sum of its proper divisors (108735747).

201321021 is a wasteful number, since it uses less digits than its factorization.

201321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358892.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 201321021 is about 14188.7638996496. The cubic root of 201321021 is about 586.0882861154.

Adding to 201321021 its reverse (120123102), we get a palindrome (321444123).

The spelling of 201321021 in words is "two hundred one million, three hundred twenty-one thousand, twenty-one".