1211122021021 has 48 divisors (see below), whose sum is σ = 1400058390528. Its totient is φ = 1045519200000.

The previous prime is 1211122021003. The next prime is 1211122021027. The reversal of 1211122021021 is 1201202211121.

It is not a de Polignac number, because 1211122021021 - 2⁵ = 1211122020989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211122020986 and 1211122021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211122021027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98611401 + ... + 98623681.

It is an arithmetic number, because the mean of its divisors is an integer number (29167883136).

Almost surely, 2^{1211122021021} is an apocalyptic number.

1211122021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211122021021 is a deficient number, since it is larger than the sum of its proper divisors (188936369507).

1211122021021 is a wasteful number, since it uses less digits than its factorization.

1211122021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12826 (or 12815 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211122021021 its reverse (1201202211121), we get a palindrome (2412324232142).

The spelling of 1211122021021 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, twenty-one thousand, twenty-one".