21120202010124 has 36 divisors (see below), whose sum is σ = 61013916918864. Its totient is φ = 6034343431392.

The previous prime is 21120202010123. The next prime is 21120202010213. The reversal of 21120202010124 is 42101020202112.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21120202010097 and 21120202010106.

It is not an unprimeable number, because it can be changed into a prime (21120202010123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41905162467 + ... + 41905162970.

It is an arithmetic number, because the mean of its divisors is an integer number (1694831025524).

Almost surely, 2^{21120202010124} is an apocalyptic number.

It is an amenable number.

21120202010124 is an abundant number, since it is smaller than the sum of its proper divisors (39893714908740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120202010124 is a wasteful number, since it uses less digits than its factorization.

21120202010124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83810325454 (or 83810325449 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21120202010124 its reverse (42101020202112), we get a palindrome (63221222212236).

The spelling of 21120202010124 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, ten thousand, one hundred twenty-four".