12221111001021 has 32 divisors (see below), whose sum is σ = 18649585463040. Its totient is φ = 7051977083904.

The previous prime is 12221111001019. The next prime is 12221111001023. The reversal of 12221111001021 is 12010011112221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12221111001019) and next prime (12221111001023).

It is not a de Polignac number, because 12221111001021 - 2¹ = 12221111001019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221111001023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34083825 + ... + 34440518.

It is an arithmetic number, because the mean of its divisors is an integer number (582799545720).

Almost surely, 2^{12221111001021} is an apocalyptic number.

It is an amenable number.

12221111001021 is a deficient number, since it is larger than the sum of its proper divisors (6428474462019).

12221111001021 is a wasteful number, since it uses less digits than its factorization.

12221111001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68524645.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 12221111001021 its reverse (12010011112221), we get a palindrome (24231122113242).

The spelling of 12221111001021 in words is "twelve trillion, two hundred twenty-one billion, one hundred eleven million, one thousand, twenty-one".