21406447607 has 8 divisors (see below), whose sum is σ = 21699038592. Its totient is φ = 21115814200.

The previous prime is 21406447597. The next prime is 21406447613. The reversal of 21406447607 is 70674460412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21406447607 - 2⁴ = 21406447591 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 (21406447637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 467369 + ... + 511122.

It is an arithmetic number, because the mean of its divisors is an integer number (2712379824).

Almost surely, 2^21406447607 is an apocalyptic number.

21406447607 is a deficient number, since it is larger than the sum of its proper divisors (292590985).

21406447607 is a wasteful number, since it uses less digits than its factorization.

21406447607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978789.

The product of its (nonzero) digits is 225792, while the sum is 41.

The spelling of 21406447607 in words is "twenty-one billion, four hundred six million, four hundred forty-seven thousand, six hundred seven".