1000202121 has 8 divisors (see below), whose sum is σ = 1481780960. Its totient is φ = 666801396.

The previous prime is 1000202113. The next prime is 1000202149. The reversal of 1000202121 is 1212020001.

It is not a de Polignac number, because 1000202121 - 2³ = 1000202113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000202101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18522235 + ... + 18522288.

It is an arithmetic number, because the mean of its divisors is an integer number (185222620).

Almost surely, 2^1000202121 is an apocalyptic number.

It is an amenable number.

1000202121 is a deficient number, since it is larger than the sum of its proper divisors (481578839).

1000202121 is an equidigital number, since it uses as much as digits as its factorization.

1000202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37044532 (or 37044526 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1000202121 is about 31625.9722538296. The cubic root of 1000202121 is about 1000.0673691280.

Adding to 1000202121 its reverse (1212020001), we get a palindrome (2212222122).

The spelling of 1000202121 in words is "one billion, two hundred two thousand, one hundred twenty-one".