21354034128 has 80 divisors (see below), whose sum is σ = 63072915456. Its totient is φ = 6098474880.

The previous prime is 21354034099. The next prime is 21354034151. The reversal of 21354034128 is 82143045312.

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, 828313 + ... + 853703.

Almost surely, 2^21354034128 is an apocalyptic number.

21354034128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21354034128 is an abundant number, since it is smaller than the sum of its proper divisors (41718881328).

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

21354034128 is a wasteful number, since it uses less digits than its factorization.

21354034128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27912 (or 27906 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 21354034128 in words is "twenty-one billion, three hundred fifty-four million, thirty-four thousand, one hundred twenty-eight".