21222562511 has 2 divisors, whose sum is σ = 21222562512. Its totient is φ = 21222562510.

The previous prime is 21222562477. The next prime is 21222562523. The reversal of 21222562511 is 11526522212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21222562511 - 2¹⁴ = 21222546127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222562811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611281255 + 10611281256.

It is an arithmetic number, because the mean of its divisors is an integer number (10611281256).

Almost surely, 2^21222562511 is an apocalyptic number.

21222562511 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222562511 is an equidigital number, since it uses as much as digits as its factorization.

21222562511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The spelling of 21222562511 in words is "twenty-one billion, two hundred twenty-two million, five hundred sixty-two thousand, five hundred eleven".