21446632470 has 32 divisors (see below), whose sum is σ = 54180967680. Its totient is φ = 5418096480.

The previous prime is 21446632469. The next prime is 21446632517. The reversal of 21446632470 is 7423664412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18812266 + ... + 18813405.

It is an arithmetic number, because the mean of its divisors is an integer number (1693155240).

Almost surely, 2^21446632470 is an apocalyptic number.

21446632470 is an abundant number, since it is smaller than the sum of its proper divisors (32734335210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21446632470 is a wasteful number, since it uses less digits than its factorization.

21446632470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37625700.

The product of its (nonzero) digits is 193536, while the sum is 39.

The spelling of 21446632470 in words is "twenty-one billion, four hundred forty-six million, six hundred thirty-two thousand, four hundred seventy".