1220212120021 has 16 divisors (see below), whose sum is σ = 1295614476288. Its totient is φ = 1147349876400.

The previous prime is 1220212120009. The next prime is 1220212120031. The reversal of 1220212120021 is 1200212120221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1220212120021 - 2⁵ = 1220212119989 is a prime.

It is a super-2 number, since 2×1220212120021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220212119977 and 1220212120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220212120031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2141701 + ... + 2650906.

It is an arithmetic number, because the mean of its divisors is an integer number (80975904768).

Almost surely, 2^{1220212120021} is an apocalyptic number.

It is an amenable number.

1220212120021 is a deficient number, since it is larger than the sum of its proper divisors (75402356267).

1220212120021 is a wasteful number, since it uses less digits than its factorization.

1220212120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4792872.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1220212120021 its reverse (1200212120221), we get a palindrome (2420424240242).

The spelling of 1220212120021 in words is "one trillion, two hundred twenty billion, two hundred twelve million, one hundred twenty thousand, twenty-one".