2121516652217 has 4 divisors (see below), whose sum is σ = 2121520367760. Its totient is φ = 2121512936676.

The previous prime is 2121516652207. The next prime is 2121516652237. The reversal of 2121516652217 is 7122566151212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121516652217 - 2⁶ = 2121516652153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121516652207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800867 + ... + 2210072.

It is an arithmetic number, because the mean of its divisors is an integer number (530380091940).

Almost surely, 2^{2121516652217} is an apocalyptic number.

It is an amenable number.

2121516652217 is a deficient number, since it is larger than the sum of its proper divisors (3715543).

2121516652217 is an equidigital number, since it uses as much as digits as its factorization.

2121516652217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3715542.

The product of its digits is 100800, while the sum is 41.

The spelling of 2121516652217 in words is "two trillion, one hundred twenty-one billion, five hundred sixteen million, six hundred fifty-two thousand, two hundred seventeen".