134428615921 has 2 divisors, whose sum is σ = 134428615922. Its totient is φ = 134428615920.

The previous prime is 134428615873. The next prime is 134428615927. The reversal of 134428615921 is 129516824431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68492647521 + 65935968400 = 261711^2 + 256780^2 .

It is a cyclic number.

It is not a de Polignac number, because 134428615921 - 2¹⁷ = 134428484849 is a prime.

It is not a weakly prime, because it can be changed into another prime (134428615927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67214307960 + 67214307961.

It is an arithmetic number, because the mean of its divisors is an integer number (67214307961).

Almost surely, 2^134428615921 is an apocalyptic number.

It is an amenable number.

134428615921 is a deficient number, since it is larger than the sum of its proper divisors (1).

134428615921 is an equidigital number, since it uses as much as digits as its factorization.

134428615921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 46.

The spelling of 134428615921 in words is "one hundred thirty-four billion, four hundred twenty-eight million, six hundred fifteen thousand, nine hundred twenty-one".