21202010044220 has 24 divisors (see below), whose sum is σ = 44555510134464. Its totient is φ = 8474844200256.

The previous prime is 21202010044199. The next prime is 21202010044273. The reversal of 21202010044220 is 2244001020212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21202010044192 and 21202010044201.

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, 372459419 + ... + 372516338.

It is an arithmetic number, because the mean of its divisors is an integer number (1856479588936).

Almost surely, 2^{21202010044220} is an apocalyptic number.

21202010044220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202010044220 is an abundant number, since it is smaller than the sum of its proper divisors (23353500090244).

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

21202010044220 is a wasteful number, since it uses less digits than its factorization.

21202010044220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744977189 (or 744977187 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21202010044220 its reverse (2244001020212), we get a palindrome (23446011064432).

The spelling of 21202010044220 in words is "twenty-one trillion, two hundred two billion, ten million, forty-four thousand, two hundred twenty".