21121201123051 has 2 divisors, whose sum is σ = 21121201123052. Its totient is φ = 21121201123050.

The previous prime is 21121201122953. The next prime is 21121201123091. The reversal of 21121201123051 is 15032110212112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121201123051 - 2³¹ = 21119053639403 is a prime.

It is a super-2 number, since 2×21121201123051² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21121201123091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560600561525 + 10560600561526.

It is an arithmetic number, because the mean of its divisors is an integer number (10560600561526).

Almost surely, 2^{21121201123051} is an apocalyptic number.

21121201123051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121201123051 is an equidigital number, since it uses as much as digits as its factorization.

21121201123051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 22.

Adding to 21121201123051 its reverse (15032110212112), we get a palindrome (36153311335163).

The spelling of 21121201123051 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred one million, one hundred twenty-three thousand, fifty-one".