21354154680 has 32 divisors (see below), whose sum is σ = 64062464400. Its totient is φ = 5694441216.

The previous prime is 21354154637. The next prime is 21354154697. The reversal of 21354154680 is 8645145312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88975525 + ... + 88975764.

Almost surely, 2^21354154680 is an apocalyptic number.

21354154680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21354154680 is an abundant number, since it is smaller than the sum of its proper divisors (42708309720).

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

21354154680 is a wasteful number, since it uses less digits than its factorization.

21354154680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177951303 (or 177951299 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

Adding to 21354154680 its reverse (8645145312), we get a palindrome (29999299992).

The spelling of 21354154680 in words is "twenty-one billion, three hundred fifty-four million, one hundred fifty-four thousand, six hundred eighty".