21403705157304 has 16 divisors (see below), whose sum is σ = 53509262893320. Its totient is φ = 7134568385760.

The previous prime is 21403705157281. The next prime is 21403705157309. The reversal of 21403705157304 is 40375150730412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403705157309) 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, 445910524087 + ... + 445910524134.

Almost surely, 2^{21403705157304} is an apocalyptic number.

21403705157304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21403705157304 is an abundant number, since it is smaller than the sum of its proper divisors (32105557736016).

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

21403705157304 is a wasteful number, since it uses less digits than its factorization.

21403705157304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891821048230 (or 891821048226 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 42.

Adding to 21403705157304 its reverse (40375150730412), we get a palindrome (61778855887716).

The spelling of 21403705157304 in words is "twenty-one trillion, four hundred three billion, seven hundred five million, one hundred fifty-seven thousand, three hundred four".