21121110022351 has 2 divisors, whose sum is σ = 21121110022352. Its totient is φ = 21121110022350.

The previous prime is 21121110022211. The next prime is 21121110022357. The reversal of 21121110022351 is 15322001112112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121110022351 - 2¹⁵ = 21121109989583 is a prime.

It is a super-2 number, since 2×21121110022351² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121110022357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560555011175 + 10560555011176.

It is an arithmetic number, because the mean of its divisors is an integer number (10560555011176).

Almost surely, 2^{21121110022351} is an apocalyptic number.

21121110022351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121110022351 is an equidigital number, since it uses as much as digits as its factorization.

21121110022351 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 21121110022351 its reverse (15322001112112), we get a palindrome (36443111134463).

The spelling of 21121110022351 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, twenty-two thousand, three hundred fifty-one".