10001221122020 has 24 divisors (see below), whose sum is σ = 21002623777464. Its totient is φ = 4000477130496.

The previous prime is 10001221121993. The next prime is 10001221122023. The reversal of 10001221122020 is 2022112210001.

It can be written as a sum of positive squares in 4 ways, for example, as 406541411236 + 9594679710784 = 637606^2 + 3097528^2 .

It is a junction number, because it is equal to n+sod(n) for n = 10001221121986 and 10001221122004.

It is not an unprimeable number, because it can be changed into a prime (10001221122023) 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, 13412534 + ... + 14138546.

It is an arithmetic number, because the mean of its divisors is an integer number (875109324061).

Almost surely, 2^{10001221122020} is an apocalyptic number.

10001221122020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10001221122020 is an abundant number, since it is smaller than the sum of its proper divisors (11001402655444).

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

10001221122020 is a wasteful number, since it uses less digits than its factorization.

10001221122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414799 (or 1414797 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10001221122020 its reverse (2022112210001), we get a palindrome (12023333332021).

The spelling of 10001221122020 in words is "ten trillion, one billion, two hundred twenty-one million, one hundred twenty-two thousand, twenty".