21012110010121 has 8 divisors (see below), whose sum is σ = 21204978343560. Its totient is φ = 20819243434752.

The previous prime is 21012110010071. The next prime is 21012110010191. The reversal of 21012110010121 is 12101001121012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10239929600121 + 10772180410000 = 3199989^2 + 3282100^2 .

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 21012110010121 - 2¹⁹ = 21012109485833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012110010191) 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, 45615471 + ... + 46073803.

It is an arithmetic number, because the mean of its divisors is an integer number (2650622292945).

Almost surely, 2^{21012110010121} is an apocalyptic number.

It is an amenable number.

21012110010121 is a deficient number, since it is larger than the sum of its proper divisors (192868333439).

21012110010121 is a wasteful number, since it uses less digits than its factorization.

21012110010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879035.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21012110010121 its reverse (12101001121012), we get a palindrome (33113111131133).

The spelling of 21012110010121 in words is "twenty-one trillion, twelve billion, one hundred ten million, ten thousand, one hundred twenty-one".