21335142229 has 2 divisors, whose sum is σ = 21335142230. Its totient is φ = 21335142228.

The previous prime is 21335142203. The next prime is 21335142251. The reversal of 21335142229 is 92224153312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17955464004 + 3379678225 = 133998^2 + 58135^2 .

It is a cyclic number.

It is not a de Polignac number, because 21335142229 - 2⁵ = 21335142197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21335142194 and 21335142203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21335142289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667571114 + 10667571115.

It is an arithmetic number, because the mean of its divisors is an integer number (10667571115).

Almost surely, 2^21335142229 is an apocalyptic number.

It is an amenable number.

21335142229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21335142229 is an equidigital number, since it uses as much as digits as its factorization.

21335142229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The spelling of 21335142229 in words is "twenty-one billion, three hundred thirty-five million, one hundred forty-two thousand, two hundred twenty-nine".