133898610821 has 2 divisors, whose sum is σ = 133898610822. Its totient is φ = 133898610820.

The previous prime is 133898610737. The next prime is 133898610847. The reversal of 133898610821 is 128016898331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94732221796 + 39166389025 = 307786^2 + 197905^2 .

It is a cyclic number.

It is not a de Polignac number, because 133898610821 - 2²² = 133894416517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133898610821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133898670821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66949305410 + 66949305411.

It is an arithmetic number, because the mean of its divisors is an integer number (66949305411).

Almost surely, 2^133898610821 is an apocalyptic number.

It is an amenable number.

133898610821 is a deficient number, since it is larger than the sum of its proper divisors (1).

133898610821 is an equidigital number, since it uses as much as digits as its factorization.

133898610821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 50.

The spelling of 133898610821 in words is "one hundred thirty-three billion, eight hundred ninety-eight million, six hundred ten thousand, eight hundred twenty-one".