21403179470 has 32 divisors (see below), whose sum is σ = 41649444000. Its totient is φ = 7891468416.

The previous prime is 21403179467. The next prime is 21403179481. The reversal of 21403179470 is 7497130412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1515245 + ... + 1529304.

It is an arithmetic number, because the mean of its divisors is an integer number (1301545125).

Almost surely, 2^21403179470 is an apocalyptic number.

21403179470 is a deficient number, since it is larger than the sum of its proper divisors (20246264530).

21403179470 is a wasteful number, since it uses less digits than its factorization.

21403179470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044612.

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 21403179470 in words is "twenty-one billion, four hundred three million, one hundred seventy-nine thousand, four hundred seventy".