21236543470 has 8 divisors (see below), whose sum is σ = 38225778264. Its totient is φ = 8494617384.

The previous prime is 21236543467. The next prime is 21236543473. The reversal of 21236543470 is 7434563212.

It is an interprime number because it is at equal distance from previous prime (21236543467) and next prime (21236543473).

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

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236543473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061827164 + ... + 1061827183.

It is an arithmetic number, because the mean of its divisors is an integer number (4778222283).

Almost surely, 2^21236543470 is an apocalyptic number.

21236543470 is a deficient number, since it is larger than the sum of its proper divisors (16989234794).

21236543470 is a wasteful number, since it uses less digits than its factorization.

21236543470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123654354.

The product of its (nonzero) digits is 120960, while the sum is 37.

The spelling of 21236543470 in words is "twenty-one billion, two hundred thirty-six million, five hundred forty-three thousand, four hundred seventy".