21000201220220 has 48 divisors (see below), whose sum is σ = 44582822601408. Its totient is φ = 8308393451520.

The previous prime is 21000201220213. The next prime is 21000201220249. The reversal of 21000201220220 is 2202210200012.

It is a junction number, because it is equal to n+sod(n) for n = 21000201220195 and 21000201220204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4517189 + ... + 7899708.

It is an arithmetic number, because the mean of its divisors is an integer number (928808804196).

Almost surely, 2^{21000201220220} is an apocalyptic number.

21000201220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000201220220 is an abundant number, since it is smaller than the sum of its proper divisors (23582621381188).

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

21000201220220 is a wasteful number, since it uses less digits than its factorization.

21000201220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12417830 (or 12417828 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21000201220220 its reverse (2202210200012), we get a palindrome (23202411420232).

The spelling of 21000201220220 in words is "twenty-one trillion, two hundred one million, two hundred twenty thousand, two hundred twenty".