221211012001 has 12 divisors (see below), whose sum is σ = 268515231552. Its totient is φ = 181365549288.

The previous prime is 221211011971. The next prime is 221211012031. The reversal of 221211012001 is 100210112122.

It is an interprime number because it is at equal distance from previous prime (221211011971) and next prime (221211012031).

It is not a de Polignac number, because 221211012001 - 2⁵ = 221211011969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221211012031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98140405 + ... + 98142658.

It is an arithmetic number, because the mean of its divisors is an integer number (22376269296).

Almost surely, 2^221211012001 is an apocalyptic number.

It is an amenable number.

221211012001 is a deficient number, since it is larger than the sum of its proper divisors (47304219551).

221211012001 is a wasteful number, since it uses less digits than its factorization.

221211012001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196283100 (or 196283093 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221211012001 its reverse (100210112122), we get a palindrome (321421124123).

The spelling of 221211012001 in words is "two hundred twenty-one billion, two hundred eleven million, twelve thousand, one".