1021021101 has 12 divisors (see below), whose sum is σ = 1475100640. Its totient is φ = 680545800.

The previous prime is 1021021093. The next prime is 1021021103. The reversal of 1021021101 is 1011201201.

It is a happy number.

It is not a de Polignac number, because 1021021101 - 2³ = 1021021093 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021021103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61326 + ... + 76176.

Almost surely, 2^1021021101 is an apocalyptic number.

It is an amenable number.

1021021101 is a deficient number, since it is larger than the sum of its proper divisors (454079539).

1021021101 is a wasteful number, since it uses less digits than its factorization.

1021021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22496 (or 22493 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1021021101 is about 31953.4208027873. The cubic root of 1021021101 is about 1006.9585006238.

Adding to 1021021101 its reverse (1011201201), we get a palindrome (2032222302).

The spelling of 1021021101 in words is "one billion, twenty-one million, twenty-one thousand, one hundred one".