21640024654446 has 32 divisors (see below), whose sum is σ = 47682070540416. Its totient is φ = 6492656660000.

The previous prime is 21640024654433. The next prime is 21640024654477. The reversal of 21640024654446 is 64445642004612.

It is a junction number, because it is equal to n+sod(n) for n = 21640024654395 and 21640024654404.

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, 1623157500 + ... + 1623170831.

It is an arithmetic number, because the mean of its divisors is an integer number (1490064704388).

Almost surely, 2^{21640024654446} is an apocalyptic number.

21640024654446 is an abundant number, since it is smaller than the sum of its proper divisors (26042045885970).

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

21640024654446 is a wasteful number, since it uses less digits than its factorization.

21640024654446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246328448.

The product of its (nonzero) digits is 4423680, while the sum is 48.

The spelling of 21640024654446 in words is "twenty-one trillion, six hundred forty billion, twenty-four million, six hundred fifty-four thousand, four hundred forty-six".