202021221 has 32 divisors (see below), whose sum is σ = 289578240. Its totient is φ = 125024256.

The previous prime is 202021219. The next prime is 202021223. The reversal of 202021221 is 122120202.

It is an interprime number because it is at equal distance from previous prime (202021219) and next prime (202021223).

It is not a de Polignac number, because 202021221 - 2¹ = 202021219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202021197 and 202021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202021223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 311920 + ... + 312566.

It is an arithmetic number, because the mean of its divisors is an integer number (9049320).

Almost surely, 2^202021221 is an apocalyptic number.

It is an amenable number.

202021221 is a deficient number, since it is larger than the sum of its proper divisors (87557019).

202021221 is a wasteful number, since it uses less digits than its factorization.

202021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 202021221 is about 14213.4169361206. The cubic root of 202021221 is about 586.7669769004.

Adding to 202021221 its reverse (122120202), we get a palindrome (324141423).

It can be divided in two parts, 20202 and 1221, that multiplied together give a palindrome (24666642).

The spelling of 202021221 in words is "two hundred two million, twenty-one thousand, two hundred twenty-one".