21021201100051 has 2 divisors, whose sum is σ = 21021201100052. Its totient is φ = 21021201100050.

The previous prime is 21021201100001. The next prime is 21021201100127. The reversal of 21021201100051 is 15000110212012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21021201100051 - 2¹⁵ = 21021201067283 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21021201099998 and 21021201100034.

It is not a weakly prime, because it can be changed into another prime (21021201100001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510600550025 + 10510600550026.

It is an arithmetic number, because the mean of its divisors is an integer number (10510600550026).

Almost surely, 2^{21021201100051} is an apocalyptic number.

21021201100051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021201100051 is an equidigital number, since it uses as much as digits as its factorization.

21021201100051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 21021201100051 its reverse (15000110212012), we get a palindrome (36021311312063).

The spelling of 21021201100051 in words is "twenty-one trillion, twenty-one billion, two hundred one million, one hundred thousand, fifty-one".