2121547230720 has 560 divisors, whose sum is σ = 7641093572640. Its totient is φ = 564673462272.

The previous prime is 2121547230709. The next prime is 2121547230727. The reversal of 2121547230720 is 270327451212.

2121547230720 is a `hidden beast` number, since 2 + 1 + 21 + 547 + 23 + 0 + 72 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121547230727) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1715073942 + ... + 1715075178.

Almost surely, 2^{2121547230720} is an apocalyptic number.

2121547230720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121547230720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3820546786320).

2121547230720 is an abundant number, since it is smaller than the sum of its proper divisors (5519546341920).

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

2121547230720 is an frugal number, since it uses more digits than its factorization.

2121547230720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197 (or 2166 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The spelling of 2121547230720 in words is "two trillion, one hundred twenty-one billion, five hundred forty-seven million, two hundred thirty thousand, seven hundred twenty".