1211001022164 has 24 divisors (see below), whose sum is σ = 2825702215840. Its totient is φ = 403662269664.

The previous prime is 1211001022159. The next prime is 1211001022229. The reversal of 1211001022164 is 4612201001121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211001022164.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 562947 + ... + 1654965.

Almost surely, 2^{1211001022164} is an apocalyptic number.

It is an amenable number.

1211001022164 is an abundant number, since it is smaller than the sum of its proper divisors (1614701193676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211001022164 is a wasteful number, since it uses less digits than its factorization.

1211001022164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184439 (or 1184437 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 1211001022164 its reverse (4612201001121), we get a palindrome (5823202023285).

The spelling of 1211001022164 in words is "one trillion, two hundred eleven billion, one million, twenty-two thousand, one hundred sixty-four".