21420477035320 has 32 divisors (see below), whose sum is σ = 52577534542320. Its totient is φ = 7789264376320.

The previous prime is 21420477035299. The next prime is 21420477035381. The reversal of 21420477035320 is 2353077402412.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 24341450737 + ... + 24341451616.

Almost surely, 2^{21420477035320} is an apocalyptic number.

21420477035320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21420477035320 is an abundant number, since it is smaller than the sum of its proper divisors (31157057507000).

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

21420477035320 is a wasteful number, since it uses less digits than its factorization.

21420477035320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48682902375 (or 48682902371 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 40.

The spelling of 21420477035320 in words is "twenty-one trillion, four hundred twenty billion, four hundred seventy-seven million, thirty-five thousand, three hundred twenty".