21203001000120 has 32 divisors (see below), whose sum is σ = 63609003000720. Its totient is φ = 5654133600000.

The previous prime is 21203001000011. The next prime is 21203001000127. The reversal of 21203001000120 is 2100010030212.

It is a super-2 number, since 2×21203001000120² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21203001000096 and 21203001000105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203001000127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88345837381 + ... + 88345837620.

Almost surely, 2^{21203001000120} is an apocalyptic number.

21203001000120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203001000120 is an abundant number, since it is smaller than the sum of its proper divisors (42406002000600).

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

21203001000120 is a wasteful number, since it uses less digits than its factorization.

21203001000120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176691675015 (or 176691675011 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21203001000120 its reverse (2100010030212), we get a palindrome (23303011030332).

The spelling of 21203001000120 in words is "twenty-one trillion, two hundred three billion, one million, one hundred twenty", and thus it is an aban number.