1021210121 has 8 divisors (see below), whose sum is σ = 1026747840. Its totient is φ = 1015681968.

The previous prime is 1021210103. The next prime is 1021210133. The reversal of 1021210121 is 1210121201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021210121 is a prime.

It is a super-2 number, since 2×1021210121² = 2085740222465669282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021210921) 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, 326915 + ... + 330023.

It is an arithmetic number, because the mean of its divisors is an integer number (128343480).

Almost surely, 2^1021210121 is an apocalyptic number.

It is an amenable number.

1021210121 is a deficient number, since it is larger than the sum of its proper divisors (5537719).

1021210121 is a wasteful number, since it uses less digits than its factorization.

1021210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4783.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1021210121 is about 31956.3784086996. The cubic root of 1021210121 is about 1007.0206356608.

Adding to 1021210121 its reverse (1210121201), we get a palindrome (2231331322).

The spelling of 1021210121 in words is "one billion, twenty-one million, two hundred ten thousand, one hundred twenty-one".