21210430650240 has 128 divisors (see below), whose sum is σ = 72808882221600. Its totient is φ = 5221029076992.

The previous prime is 21210430650203. The next prime is 21210430650259. The reversal of 21210430650240 is 4205603401212.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21210430650198 and 21210430650207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424863475 + ... + 424913394.

Almost surely, 2^{21210430650240} is an apocalyptic number.

21210430650240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210430650240 is an abundant number, since it is smaller than the sum of its proper divisors (51598451571360).

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

21210430650240 is a wasteful number, since it uses less digits than its factorization.

21210430650240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849776904 (or 849776892 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 21210430650240 in words is "twenty-one trillion, two hundred ten billion, four hundred thirty million, six hundred fifty thousand, two hundred forty".