21088863489428 has 72 divisors (see below), whose sum is σ = 44798771771712. Its totient is φ = 8644871321856.

The previous prime is 21088863489409. The next prime is 21088863489437. The reversal of 21088863489428 is 82498436888012.

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 23 ways as a sum of consecutive naturals, for example, 302258075 + ... + 302327837.

It is an arithmetic number, because the mean of its divisors is an integer number (622205163496).

Almost surely, 2^{21088863489428} is an apocalyptic number.

21088863489428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21088863489428 is an abundant number, since it is smaller than the sum of its proper divisors (23709908282284).

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

21088863489428 is a wasteful number, since it uses less digits than its factorization.

21088863489428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136861 (or 136852 counting only the distinct ones).

The product of its (nonzero) digits is 339738624, while the sum is 71.

The spelling of 21088863489428 in words is "twenty-one trillion, eighty-eight billion, eight hundred sixty-three million, four hundred eighty-nine thousand, four hundred twenty-eight".