16021656420 has 144 divisors (see below), whose sum is σ = 56929013568. Its totient is φ = 3329168640.

The previous prime is 16021656401. The next prime is 16021656433. The reversal of 16021656420 is 2465612061.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 215367 + ... + 280046.

It is an arithmetic number, because the mean of its divisors is an integer number (395340372).

Almost surely, 2^16021656420 is an apocalyptic number.

16021656420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16021656420 is an abundant number, since it is smaller than the sum of its proper divisors (40907357148).

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

16021656420 is a wasteful number, since it uses less digits than its factorization.

16021656420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495450 (or 495441 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 16021656420 in words is "sixteen billion, twenty-one million, six hundred fifty-six thousand, four hundred twenty".