21021401430 has 48 divisors (see below), whose sum is σ = 54665913744. Its totient is φ = 5604653760.

The previous prime is 21021401411. The next prime is 21021401447. The reversal of 21021401430 is 3410412012.

21021401430 is a `hidden beast` number, since 21 + 0 + 214 + 0 + 1 + 430 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 538885 + ... + 576575.

It is an arithmetic number, because the mean of its divisors is an integer number (1138873203).

Almost surely, 2^21021401430 is an apocalyptic number.

21021401430 is an abundant number, since it is smaller than the sum of its proper divisors (33644512314).

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

21021401430 is a wasteful number, since it uses less digits than its factorization.

21021401430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43901 (or 43898 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21021401430 its reverse (3410412012), we get a palindrome (24431813442).

The spelling of 21021401430 in words is "twenty-one billion, twenty-one million, four hundred one thousand, four hundred thirty".