21214083128 has 24 divisors (see below), whose sum is σ = 46270513800. Its totient is φ = 9091749744.

The previous prime is 21214083109. The next prime is 21214083139. The reversal of 21214083128 is 82138041212.

It is a junction number, because it is equal to n+sod(n) for n = 21214083094 and 21214083103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27058388 + ... + 27059171.

It is an arithmetic number, because the mean of its divisors is an integer number (1927938075).

Almost surely, 2^21214083128 is an apocalyptic number.

21214083128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21214083128 is an abundant number, since it is smaller than the sum of its proper divisors (25056430672).

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

21214083128 is a wasteful number, since it uses less digits than its factorization.

21214083128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54117579 (or 54117568 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The spelling of 21214083128 in words is "twenty-one billion, two hundred fourteen million, eighty-three thousand, one hundred twenty-eight".