21010122202121 has 8 divisors (see below), whose sum is σ = 22626637152000. Its totient is φ = 19393657495632.

The previous prime is 21010122202109. The next prime is 21010122202229. The reversal of 21010122202121 is 12120222101012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010122202121 is a prime.

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 21010122202121.

It is not an unprimeable number, because it can be changed into a prime (21010122202721) 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, 11690105 + ... + 13367078.

It is an arithmetic number, because the mean of its divisors is an integer number (2828329644000).

Almost surely, 2^{21010122202121} is an apocalyptic number.

It is an amenable number.

21010122202121 is a deficient number, since it is larger than the sum of its proper divisors (1616514949879).

21010122202121 is a wasteful number, since it uses less digits than its factorization.

21010122202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25121695.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21010122202121 its reverse (12120222101012), we get a palindrome (33130344303133).

The spelling of 21010122202121 in words is "twenty-one trillion, ten billion, one hundred twenty-two million, two hundred two thousand, one hundred twenty-one".