1001211010221 has 16 divisors (see below), whose sum is σ = 1378687089600. Its totient is φ = 645806032128.

The previous prime is 1001211010211. The next prime is 1001211010223. The reversal of 1001211010221 is 1220101121001.

It is not a de Polignac number, because 1001211010221 - 2⁶ = 1001211010157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001211010197 and 1001211010206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001211010223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25175436 + ... + 25215173.

It is an arithmetic number, because the mean of its divisors is an integer number (86167943100).

Almost surely, 2^{1001211010221} is an apocalyptic number.

It is an amenable number.

1001211010221 is a deficient number, since it is larger than the sum of its proper divisors (377476079379).

1001211010221 is a wasteful number, since it uses less digits than its factorization.

1001211010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50390828.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1001211010221 its reverse (1220101121001), we get a palindrome (2221312131222).

The spelling of 1001211010221 in words is "one trillion, one billion, two hundred eleven million, ten thousand, two hundred twenty-one".