1211001022101 has 8 divisors (see below), whose sum is σ = 1738873262560. Its totient is φ = 745231398192.

The previous prime is 1211001022067. The next prime is 1211001022109. The reversal of 1211001022101 is 1012201001121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211001022101 - 2²³ = 1210992633493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211001022109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15525654091 + ... + 15525654168.

It is an arithmetic number, because the mean of its divisors is an integer number (217359157820).

Almost surely, 2^{1211001022101} is an apocalyptic number.

It is an amenable number.

1211001022101 is a deficient number, since it is larger than the sum of its proper divisors (527872240459).

1211001022101 is a wasteful number, since it uses less digits than its factorization.

1211001022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31051308275.

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

Adding to 1211001022101 its reverse (1012201001121), we get a palindrome (2223202023222).

The spelling of 1211001022101 in words is "one trillion, two hundred eleven billion, one million, twenty-two thousand, one hundred one".