21010021210320 has 40 divisors (see below), whose sum is σ = 65131065752736. Its totient is φ = 5602672322688.

The previous prime is 21010021210291. The next prime is 21010021210333. The reversal of 21010021210320 is 2301212001012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21010021210320.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43770877282 + ... + 43770877761.

Almost surely, 2^{21010021210320} is an apocalyptic number.

21010021210320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010021210320 is an abundant number, since it is smaller than the sum of its proper divisors (44121044542416).

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

21010021210320 is a wasteful number, since it uses less digits than its factorization.

21010021210320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87541755059 (or 87541755053 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21010021210320 its reverse (2301212001012), we get a palindrome (23311233211332).

The spelling of 21010021210320 in words is "twenty-one trillion, ten billion, twenty-one million, two hundred ten thousand, three hundred twenty".