21225252253 has 2 divisors, whose sum is σ = 21225252254. Its totient is φ = 21225252252.

The previous prime is 21225252211. The next prime is 21225252259. The reversal of 21225252253 is 35225252212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12911095129 + 8314157124 = 113627^2 + 91182^2 .

It is a cyclic number.

It is not a de Polignac number, because 21225252253 - 2⁹ = 21225251741 is a prime.

It is a super-2 number, since 2×21225252253² (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 (21225252259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612626126 + 10612626127.

It is an arithmetic number, because the mean of its divisors is an integer number (10612626127).

Almost surely, 2^21225252253 is an apocalyptic number.

It is an amenable number.

21225252253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21225252253 is an equidigital number, since it uses as much as digits as its factorization.

21225252253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 31.

The spelling of 21225252253 in words is "twenty-one billion, two hundred twenty-five million, two hundred fifty-two thousand, two hundred fifty-three".