1102020021 has 24 divisors (see below), whose sum is σ = 1608781824. Its totient is φ = 726878880.

The previous prime is 1102020013. The next prime is 1102020041. The reversal of 1102020021 is 1200202011.

It is not a de Polignac number, because 1102020021 - 2³ = 1102020013 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 1102019985 and 1102020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1102020041) 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 23 ways as a sum of consecutive naturals, for example, 491515 + ... + 493751.

It is an arithmetic number, because the mean of its divisors is an integer number (67032576).

Almost surely, 2^1102020021 is an apocalyptic number.

It is an amenable number.

1102020021 is a deficient number, since it is larger than the sum of its proper divisors (506761803).

1102020021 is a wasteful number, since it uses less digits than its factorization.

1102020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801 (or 2798 counting only the distinct ones).

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

The square root of 1102020021 is about 33196.6868979421. The cubic root of 1102020021 is about 1032.9116161795.

Adding to 1102020021 its reverse (1200202011), we get a palindrome (2302222032).

The spelling of 1102020021 in words is "one billion, one hundred two million, twenty thousand, twenty-one".