21221200010121 has 8 divisors (see below), whose sum is σ = 28305071277504. Its totient is φ = 14142397708080.

The previous prime is 21221200010111. The next prime is 21221200010159. The reversal of 21221200010121 is 12101000212212.

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

It is not a de Polignac number, because 21221200010121 - 2¹⁸ = 21221199747977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221200010121.

It is not an unprimeable number, because it can be changed into a prime (21221200010111) 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, 1267231566 + ... + 1267248311.

It is an arithmetic number, because the mean of its divisors is an integer number (3538133909688).

Almost surely, 2^{21221200010121} is an apocalyptic number.

It is an amenable number.

21221200010121 is a deficient number, since it is larger than the sum of its proper divisors (7083871267383).

21221200010121 is a wasteful number, since it uses less digits than its factorization.

21221200010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534482671.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221200010121 its reverse (12101000212212), we get a palindrome (33322200222333).

The spelling of 21221200010121 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, ten thousand, one hundred twenty-one".