1102100100021 has 32 divisors (see below), whose sum is σ = 1643560243200. Its totient is φ = 729873186480.

The previous prime is 1102100100007. The next prime is 1102100100071. The reversal of 1102100100021 is 1200010012011.

It is a happy number.

It is not a de Polignac number, because 1102100100021 - 2¹⁵ = 1102100067253 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 = 1102100099976 and 1102100100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1102100100071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4575420 + ... + 4810266.

It is an arithmetic number, because the mean of its divisors is an integer number (51361257600).

Almost surely, 2^{1102100100021} is an apocalyptic number.

It is an amenable number.

1102100100021 is a deficient number, since it is larger than the sum of its proper divisors (541460143179).

1102100100021 is a wasteful number, since it uses less digits than its factorization.

1102100100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236006 (or 236000 counting only the distinct ones).

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

Adding to 1102100100021 its reverse (1200010012011), we get a palindrome (2302110112032).

The spelling of 1102100100021 in words is "one trillion, one hundred two billion, one hundred million, one hundred thousand, twenty-one".