21002101124 has 12 divisors (see below), whose sum is σ = 36756056064. Its totient is φ = 10500370824.

The previous prime is 21002101097. The next prime is 21002101177. The reversal of 21002101124 is 42110120012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21002101099 and 21002101108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96932 + ... + 226715.

It is an arithmetic number, because the mean of its divisors is an integer number (3063004672).

Almost surely, 2^21002101124 is an apocalyptic number.

It is an amenable number.

21002101124 is a deficient number, since it is larger than the sum of its proper divisors (15753954940).

21002101124 is a wasteful number, since it uses less digits than its factorization.

21002101124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339874 (or 339872 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21002101124 its reverse (42110120012), we get a palindrome (63112221136).

The spelling of 21002101124 in words is "twenty-one billion, two million, one hundred one thousand, one hundred twenty-four".