21040021434352 has 20 divisors (see below), whose sum is σ = 42537434639760. Its totient is φ = 10062618946688.

The previous prime is 21040021434347. The next prime is 21040021434353. The reversal of 21040021434352 is 25343412004012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040021434353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28586985277 + ... + 28586986012.

It is an arithmetic number, because the mean of its divisors is an integer number (2126871731988).

Almost surely, 2^{21040021434352} is an apocalyptic number.

It is an amenable number.

21040021434352 is an abundant number, since it is smaller than the sum of its proper divisors (21497413205408).

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

21040021434352 is a wasteful number, since it uses less digits than its factorization.

21040021434352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57173971320 (or 57173971314 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 21040021434352 its reverse (25343412004012), we get a palindrome (46383433438364).

The spelling of 21040021434352 in words is "twenty-one trillion, forty billion, twenty-one million, four hundred thirty-four thousand, three hundred fifty-two".