21500347022121 has 8 divisors (see below), whose sum is σ = 31273232032224. Its totient is φ = 13030513346720.

The previous prime is 21500347022117. The next prime is 21500347022153. The reversal of 21500347022121 is 12122074300512.

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

It is a cyclic number.

It is not a de Polignac number, because 21500347022121 - 2² = 21500347022117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21500347022171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325762833636 + ... + 325762833701.

It is an arithmetic number, because the mean of its divisors is an integer number (3909154004028).

Almost surely, 2^{21500347022121} is an apocalyptic number.

It is an amenable number.

21500347022121 is a deficient number, since it is larger than the sum of its proper divisors (9772885010103).

21500347022121 is a wasteful number, since it uses less digits than its factorization.

21500347022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651525667351.

The product of its (nonzero) digits is 6720, while the sum is 30.

The spelling of 21500347022121 in words is "twenty-one trillion, five hundred billion, three hundred forty-seven million, twenty-two thousand, one hundred twenty-one".