1021636121 has 8 divisors (see below), whose sum is σ = 1117296288. Its totient is φ = 926440000.

The previous prime is 1021636117. The next prime is 1021636139. The reversal of 1021636121 is 1216361201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021636121 - 2² = 1021636117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021636141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111395 + ... + 120216.

It is an arithmetic number, because the mean of its divisors is an integer number (139662036).

Almost surely, 2^1021636121 is an apocalyptic number.

1021636121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021636121 is a deficient number, since it is larger than the sum of its proper divisors (95660167).

1021636121 is a wasteful number, since it uses less digits than its factorization.

1021636121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232023.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1021636121 is about 31963.0430497473. The cubic root of 1021636121 is about 1007.1606431363.

Adding to 1021636121 its reverse (1216361201), we get a palindrome (2237997322).

The spelling of 1021636121 in words is "one billion, twenty-one million, six hundred thirty-six thousand, one hundred twenty-one".