21003021121320 has 256 divisors, whose sum is σ = 84222641664000. Its totient is φ = 4548022587648.

The previous prime is 21003021121319. The next prime is 21003021121351. The reversal of 21003021121320 is 2312112030012.

21003021121320 is a `hidden beast` number, since 2 + 10 + 0 + 302 + 11 + 21 + 320 = 666.

It is a super-2 number, since 2×21003021121320² (a number of 27 digits) contains 22 as substring.

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 = 21003021121293 and 21003021121302.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 72966292 + ... + 73253571.

It is an arithmetic number, because the mean of its divisors is an integer number (328994694000).

Almost surely, 2^{21003021121320} is an apocalyptic number.

21003021121320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003021121320 is an abundant number, since it is smaller than the sum of its proper divisors (63219620542680).

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

21003021121320 is a wasteful number, since it uses less digits than its factorization.

21003021121320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146219909 (or 146219899 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21003021121320 its reverse (2312112030012), we get a palindrome (23315133151332).

The spelling of 21003021121320 in words is "twenty-one trillion, three billion, twenty-one million, one hundred twenty-one thousand, three hundred twenty".