21307430407 has 16 divisors (see below), whose sum is σ = 21847069440. Its totient is φ = 20775750912.

The previous prime is 21307430399. The next prime is 21307430429. The reversal of 21307430407 is 70403470312.

It is a cyclic number.

It is not a de Polignac number, because 21307430407 - 2³ = 21307430399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21307430447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3047838 + ... + 3054820.

It is an arithmetic number, because the mean of its divisors is an integer number (1365441840).

Almost surely, 2^21307430407 is an apocalyptic number.

21307430407 is a deficient number, since it is larger than the sum of its proper divisors (539639033).

21307430407 is an equidigital number, since it uses as much as digits as its factorization.

21307430407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7542.

The product of its (nonzero) digits is 14112, while the sum is 31.

The spelling of 21307430407 in words is "twenty-one billion, three hundred seven million, four hundred thirty thousand, four hundred seven".