21011201204101 has 2 divisors, whose sum is σ = 21011201204102. Its totient is φ = 21011201204100.

The previous prime is 21011201203957. The next prime is 21011201204159. The reversal of 21011201204101 is 10140210211012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14211618228900 + 6799582975201 = 3769830^2 + 2607601^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011201204101 - 2¹⁵ = 21011201171333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011201204801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505600602050 + 10505600602051.

It is an arithmetic number, because the mean of its divisors is an integer number (10505600602051).

Almost surely, 2^{21011201204101} is an apocalyptic number.

It is an amenable number.

21011201204101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011201204101 is an equidigital number, since it uses as much as digits as its factorization.

21011201204101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21011201204101 its reverse (10140210211012), we get a palindrome (31151411415113).

The spelling of 21011201204101 in words is "twenty-one trillion, eleven billion, two hundred one million, two hundred four thousand, one hundred one".