221021001201 has 128 divisors (see below), whose sum is σ = 407029948416. Its totient is φ = 102951751680.

The previous prime is 221021001199. The next prime is 221021001241. The reversal of 221021001201 is 102100120122.

It is not a de Polignac number, because 221021001201 - 2¹ = 221021001199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221021001241) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 91443145 + ... + 91445561.

It is an arithmetic number, because the mean of its divisors is an integer number (3179921472).

Almost surely, 2^221021001201 is an apocalyptic number.

221021001201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221021001201 is a deficient number, since it is larger than the sum of its proper divisors (186008947215).

221021001201 is a wasteful number, since it uses less digits than its factorization.

221021001201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311.

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

Adding to 221021001201 its reverse (102100120122), we get a palindrome (323121121323).

It can be divided in two parts, 22 and 1021001201, that multiplied together give a palindrome (22462026422).

The spelling of 221021001201 in words is "two hundred twenty-one billion, twenty-one million, one thousand, two hundred one".