21222154601 has 2 divisors, whose sum is σ = 21222154602. Its totient is φ = 21222154600.

The previous prime is 21222154573. The next prime is 21222154619. The reversal of 21222154601 is 10645122212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18639075625 + 2583078976 = 136525^2 + 50824^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222154601 - 2⁶ = 21222154537 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222154621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611077300 + 10611077301.

It is an arithmetic number, because the mean of its divisors is an integer number (10611077301).

Almost surely, 2^21222154601 is an apocalyptic number.

It is an amenable number.

21222154601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222154601 is an equidigital number, since it uses as much as digits as its factorization.

21222154601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 21222154601 its reverse (10645122212), we get a palindrome (31867276813).

The spelling of 21222154601 in words is "twenty-one billion, two hundred twenty-two million, one hundred fifty-four thousand, six hundred one".