2121901438500 has 288 divisors, whose sum is σ = 6913801789440. Its totient is φ = 547272288000.

The previous prime is 2121901438487. The next prime is 2121901438513. The reversal of 2121901438500 is 58341091212.

2121901438500 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 9 + 0 + 143 + 8 + 500 = 666.

It is an interprime number because it is at equal distance from previous prime (2121901438487) and next prime (2121901438513).

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 333262317 + ... + 333268683.

Almost surely, 2^{2121901438500} is an apocalyptic number.

2121901438500 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 2121901438500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3456900894720).

2121901438500 is an abundant number, since it is smaller than the sum of its proper divisors (4791900350940).

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

2121901438500 is a wasteful number, since it uses less digits than its factorization.

2121901438500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8812 (or 8797 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 2121901438500 in words is "two trillion, one hundred twenty-one billion, nine hundred one million, four hundred thirty-eight thousand, five hundred".