2121016221385 has 8 divisors (see below), whose sum is σ = 2545228861056. Its totient is φ = 1696806713520.

The previous prime is 2121016221349. The next prime is 2121016221413. The reversal of 2121016221385 is 5831226101212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2121016221385 is a prime.

It is a super-2 number, since 2×2121016221385² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121016221385.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1133422 + ... + 2350888.

It is an arithmetic number, because the mean of its divisors is an integer number (318153607632).

Almost surely, 2^{2121016221385} is an apocalyptic number.

It is an amenable number.

2121016221385 is a deficient number, since it is larger than the sum of its proper divisors (424212639671).

2121016221385 is a wasteful number, since it uses less digits than its factorization.

2121016221385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565903.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 2121016221385 in words is "two trillion, one hundred twenty-one billion, sixteen million, two hundred twenty-one thousand, three hundred eighty-five".