21307407470 has 32 divisors (see below), whose sum is σ = 40638332448. Its totient is φ = 8015899648.

The previous prime is 21307407463. The next prime is 21307407493. The reversal of 21307407470 is 7470470312.

It is a happy number.

It is a super-2 number, since 2×21307407470² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21307407470.

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, 198674 + ... + 286506.

It is an arithmetic number, because the mean of its divisors is an integer number (1269947889).

Almost surely, 2^21307407470 is an apocalyptic number.

21307407470 is a deficient number, since it is larger than the sum of its proper divisors (19330924978).

21307407470 is a wasteful number, since it uses less digits than its factorization.

21307407470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89284.

The product of its (nonzero) digits is 32928, while the sum is 35.

Adding to 21307407470 its reverse (7470470312), we get a palindrome (28777877782).

The spelling of 21307407470 in words is "twenty-one billion, three hundred seven million, four hundred seven thousand, four hundred seventy".