21010001201220 has 24 divisors (see below), whose sum is σ = 58828003363584. Its totient is φ = 5602666986976.

The previous prime is 21010001201153. The next prime is 21010001201279. The reversal of 21010001201220 is 2210210001012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21010001201196 and 21010001201205.

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, 175083343284 + ... + 175083343403.

It is an arithmetic number, because the mean of its divisors is an integer number (2451166806816).

Almost surely, 2^{21010001201220} is an apocalyptic number.

21010001201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010001201220 is an abundant number, since it is smaller than the sum of its proper divisors (37818002162364).

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

21010001201220 is a wasteful number, since it uses less digits than its factorization.

21010001201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350166686699 (or 350166686697 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21010001201220 its reverse (2210210001012), we get a palindrome (23220211202232).

The spelling of 21010001201220 in words is "twenty-one trillion, ten billion, one million, two hundred one thousand, two hundred twenty".