21423708825536 has 56 divisors (see below), whose sum is σ = 45040009457520. Its totient is φ = 10075789504512.

The previous prime is 21423708825527. The next prime is 21423708825643. The reversal of 21423708825536 is 63552880732412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3973406 + ... + 7657373.

It is an arithmetic number, because the mean of its divisors is an integer number (804285883170).

Almost surely, 2^{21423708825536} is an apocalyptic number.

It is an amenable number.

21423708825536 is an abundant number, since it is smaller than the sum of its proper divisors (23616300631984).

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

21423708825536 is a wasteful number, since it uses less digits than its factorization.

21423708825536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11632501 (or 11632491 counting only the distinct ones).

The product of its (nonzero) digits is 19353600, while the sum is 56.

The spelling of 21423708825536 in words is "twenty-one trillion, four hundred twenty-three billion, seven hundred eight million, eight hundred twenty-five thousand, five hundred thirty-six".