202121401 has 4 divisors (see below), whose sum is σ = 210909312. Its totient is φ = 193333492.

The previous prime is 202121399. The next prime is 202121407. The reversal of 202121401 is 104121202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 104121202 = 2 ⋅52060601.

It is not a de Polignac number, because 202121401 - 2¹ = 202121399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202121407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4393921 + ... + 4393966.

It is an arithmetic number, because the mean of its divisors is an integer number (52727328).

Almost surely, 2^202121401 is an apocalyptic number.

It is an amenable number.

202121401 is a deficient number, since it is larger than the sum of its proper divisors (8787911).

202121401 is an equidigital number, since it uses as much as digits as its factorization.

202121401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8787910.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 202121401 is about 14216.9406343278. The cubic root of 202121401 is about 586.8639512044.

Adding to 202121401 its reverse (104121202), we get a palindrome (306242603).

The spelling of 202121401 in words is "two hundred two million, one hundred twenty-one thousand, four hundred one".