221001210021011 has 6 divisors (see below), whose sum is σ = 257083040228580. Its totient is φ = 189429608589396.

The previous prime is 221001210021001. The next prime is 221001210021023. The reversal of 221001210021011 is 110120012100122.

It is not a de Polignac number, because 221001210021011 - 2¹⁰ = 221001210019987 is a prime.

It is a super-2 number, since 2×221001210021011² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001210021001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2255114387921 + ... + 2255114388018.

It is an arithmetic number, because the mean of its divisors is an integer number (42847173371430).

Almost surely, 2^{221001210021011} is an apocalyptic number.

221001210021011 is a deficient number, since it is larger than the sum of its proper divisors (36081830207569).

221001210021011 is an equidigital number, since it uses as much as digits as its factorization.

221001210021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510228775953 (or 4510228775946 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221001210021011 its reverse (110120012100122), we get a palindrome (331121222121133).

It can be divided in two parts, 221001 and 210021011, that added together give a palindrome (210242012).

The spelling of 221001210021011 in words is "two hundred twenty-one trillion, one billion, two hundred ten million, twenty-one thousand, eleven".