21405341652144 has 80 divisors (see below), whose sum is σ = 55331591884800. Its totient is φ = 7130668866048.

The previous prime is 21405341652143. The next prime is 21405341652187. The reversal of 21405341652144 is 44125614350412.

It is a junction number, because it is equal to n+sod(n) for n = 21405341652096 and 21405341652105.

It is not an unprimeable number, because it can be changed into a prime (21405341652143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 626621337 + ... + 626655495.

It is an arithmetic number, because the mean of its divisors is an integer number (691644898560).

Almost surely, 2^{21405341652144} is an apocalyptic number.

21405341652144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21405341652144 is an abundant number, since it is smaller than the sum of its proper divisors (33926250232656).

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

21405341652144 is a wasteful number, since it uses less digits than its factorization.

21405341652144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41922 (or 41916 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 42.

The spelling of 21405341652144 in words is "twenty-one trillion, four hundred five billion, three hundred forty-one million, six hundred fifty-two thousand, one hundred forty-four".