21405006030 has 64 divisors (see below), whose sum is σ = 51631272000. Its totient is φ = 5679258624.

The previous prime is 21405006023. The next prime is 21405006059. The reversal of 21405006030 is 3060050412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21405005988 and 21405006006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7785096 + ... + 7787844.

It is an arithmetic number, because the mean of its divisors is an integer number (806738625).

Almost surely, 2^21405006030 is an apocalyptic number.

21405006030 is an abundant number, since it is smaller than the sum of its proper divisors (30226265970).

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

21405006030 is a wasteful number, since it uses less digits than its factorization.

21405006030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21405006030 its reverse (3060050412), we get a palindrome (24465056442).

The spelling of 21405006030 in words is "twenty-one billion, four hundred five million, six thousand, thirty".