1102101021 has 24 divisors (see below), whose sum is σ = 1832635584. Its totient is φ = 625170240.

The previous prime is 1102101017. The next prime is 1102101037. The reversal of 1102101021 is 1201012011.

It is a happy number.

It is not a de Polignac number, because 1102101021 - 2² = 1102101017 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 = 1102100994 and 1102101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1102101001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55215 + ... + 72476.

It is an arithmetic number, because the mean of its divisors is an integer number (76359816).

Almost surely, 2^1102101021 is an apocalyptic number.

It is an amenable number.

1102101021 is a deficient number, since it is larger than the sum of its proper divisors (730534563).

1102101021 is a wasteful number, since it uses less digits than its factorization.

1102101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127841 (or 127838 counting only the distinct ones).

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

The square root of 1102101021 is about 33197.9068767897. The cubic root of 1102101021 is about 1032.9369223717.

Adding to 1102101021 its reverse (1201012011), we get a palindrome (2303113032).

The spelling of 1102101021 in words is "one billion, one hundred two million, one hundred one thousand, twenty-one".