21304473406 has 32 divisors (see below), whose sum is σ = 36845604000. Its totient is φ = 9170445312.

The previous prime is 21304473401. The next prime is 21304473409. The reversal of 21304473406 is 60437440312.

It is a super-2 number, since 2×21304473406² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304473401) 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, 549871 + ... + 587338.

It is an arithmetic number, because the mean of its divisors is an integer number (1151425125).

Almost surely, 2^21304473406 is an apocalyptic number.

21304473406 is a deficient number, since it is larger than the sum of its proper divisors (15541130594).

21304473406 is a wasteful number, since it uses less digits than its factorization.

21304473406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137276.

The product of its (nonzero) digits is 48384, while the sum is 34.

The spelling of 21304473406 in words is "twenty-one billion, three hundred four million, four hundred seventy-three thousand, four hundred six".