21055005430 has 32 divisors (see below), whose sum is σ = 39287980800. Its totient is φ = 8114558592.

The previous prime is 21055005421. The next prime is 21055005463. The reversal of 21055005430 is 3450055012.

It is a junction number, because it is equal to n+sod(n) for n = 21055005395 and 21055005404.

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, 63124 + ... + 214696.

It is an arithmetic number, because the mean of its divisors is an integer number (1227749400).

Almost surely, 2^21055005430 is an apocalyptic number.

21055005430 is a deficient number, since it is larger than the sum of its proper divisors (18232975370).

21055005430 is a wasteful number, since it uses less digits than its factorization.

21055005430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152088.

The product of its (nonzero) digits is 3000, while the sum is 25.

The spelling of 21055005430 in words is "twenty-one billion, fifty-five million, five thousand, four hundred thirty".