21021121234101 has 16 divisors (see below), whose sum is σ = 30190221803520. Its totient is φ = 12972360928560.

The previous prime is 21021121234027. The next prime is 21021121234229. The reversal of 21021121234101 is 10143212112012.

It is not a de Polignac number, because 21021121234101 - 2¹⁸ = 21021120971957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021121234901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4913770941 + ... + 4913775218.

It is an arithmetic number, because the mean of its divisors is an integer number (1886888862720).

Almost surely, 2^{21021121234101} is an apocalyptic number.

It is an amenable number.

21021121234101 is a deficient number, since it is larger than the sum of its proper divisors (9169100569419).

21021121234101 is a wasteful number, since it uses less digits than its factorization.

21021121234101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9827546216.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21021121234101 its reverse (10143212112012), we get a palindrome (31164333346113).

The spelling of 21021121234101 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-one million, two hundred thirty-four thousand, one hundred one".