21222003153551 has 2 divisors, whose sum is σ = 21222003153552. Its totient is φ = 21222003153550.

The previous prime is 21222003153529. The next prime is 21222003153667. The reversal of 21222003153551 is 15535130022212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222003153551 - 2⁶ = 21222003153487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222003153511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611001576775 + 10611001576776.

It is an arithmetic number, because the mean of its divisors is an integer number (10611001576776).

Almost surely, 2^{21222003153551} is an apocalyptic number.

21222003153551 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222003153551 is an equidigital number, since it uses as much as digits as its factorization.

21222003153551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 21222003153551 its reverse (15535130022212), we get a palindrome (36757133175763).

The spelling of 21222003153551 in words is "twenty-one trillion, two hundred twenty-two billion, three million, one hundred fifty-three thousand, five hundred fifty-one".