21053435207 has 6 divisors (see below), whose sum is σ = 24490730808. Its totient is φ = 18045801564.

The previous prime is 21053435191. The next prime is 21053435281. The reversal of 21053435207 is 70253435012.

It is not a de Polignac number, because 21053435207 - 2⁴ = 21053435191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21053431207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214830923 + ... + 214831020.

It is an arithmetic number, because the mean of its divisors is an integer number (4081788468).

Almost surely, 2^21053435207 is an apocalyptic number.

21053435207 is a deficient number, since it is larger than the sum of its proper divisors (3437295601).

21053435207 is an equidigital number, since it uses as much as digits as its factorization.

21053435207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429661957 (or 429661950 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 32.

The spelling of 21053435207 in words is "twenty-one billion, fifty-three million, four hundred thirty-five thousand, two hundred seven".