21122042351 has 2 divisors, whose sum is σ = 21122042352. Its totient is φ = 21122042350.

The previous prime is 21122042299. The next prime is 21122042363. The reversal of 21122042351 is 15324022112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21122042351 - 2¹⁰ = 21122041327 is a prime.

It is a super-2 number, since 2×21122042351² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122042371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561021175 + 10561021176.

It is an arithmetic number, because the mean of its divisors is an integer number (10561021176).

Almost surely, 2^21122042351 is an apocalyptic number.

21122042351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122042351 is an equidigital number, since it uses as much as digits as its factorization.

21122042351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21122042351 its reverse (15324022112), we get a palindrome (36446064463).

The spelling of 21122042351 in words is "twenty-one billion, one hundred twenty-two million, forty-two thousand, three hundred fifty-one".