21369001434 has 32 divisors (see below), whose sum is σ = 49077135360. Its totient is φ = 6134641200.

The previous prime is 21369001387. The next prime is 21369001457. The reversal of 21369001434 is 43410096312.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 21369001395 and 21369001404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8519082 + ... + 8521589.

It is an arithmetic number, because the mean of its divisors is an integer number (1533660480).

Almost surely, 2^21369001434 is an apocalyptic number.

21369001434 is an abundant number, since it is smaller than the sum of its proper divisors (27708133926).

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

21369001434 is a wasteful number, since it uses less digits than its factorization.

21369001434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17040706.

The product of its (nonzero) digits is 15552, while the sum is 33.

Adding to 21369001434 its reverse (43410096312), we get a palindrome (64779097746).

The spelling of 21369001434 in words is "twenty-one billion, three hundred sixty-nine million, one thousand, four hundred thirty-four".