2101220212122 has 24 divisors (see below), whose sum is σ = 4552720121664. Its totient is φ = 700394994504.

The previous prime is 2101220212111. The next prime is 2101220212123. The reversal of 2101220212122 is 2212120221012.

It is a happy number.

2101220212122 is a `hidden beast` number, since 210 + 1 + 220 + 21 + 212 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2101220212095 and 2101220212104.

It is not an unprimeable number, because it can be changed into a prime (2101220212123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160713 + ... + 2056275.

It is an arithmetic number, because the mean of its divisors is an integer number (189696671736).

Almost surely, 2^{2101220212122} is an apocalyptic number.

2101220212122 is an abundant number, since it is smaller than the sum of its proper divisors (2451499909542).

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

2101220212122 is a wasteful number, since it uses less digits than its factorization.

2101220212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957154 (or 1957151 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2101220212122 its reverse (2212120221012), we get a palindrome (4313340433134).

The spelling of 2101220212122 in words is "two trillion, one hundred one billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-two".