1220212201021 has 16 divisors (see below), whose sum is σ = 1345218840000. Its totient is φ = 1097566624000.

The previous prime is 1220212201009. The next prime is 1220212201051. The reversal of 1220212201021 is 1201022120221.

It is a happy number.

It is not a de Polignac number, because 1220212201021 - 2²³ = 1220203812413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220212200986 and 1220212201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220212201051) 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, 1299045 + ... + 2031733.

It is an arithmetic number, because the mean of its divisors is an integer number (84076177500).

Almost surely, 2^{1220212201021} is an apocalyptic number.

1220212201021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220212201021 is a deficient number, since it is larger than the sum of its proper divisors (125006638979).

1220212201021 is a wasteful number, since it uses less digits than its factorization.

1220212201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734300.

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

Adding to 1220212201021 its reverse (1201022120221), we get a palindrome (2421234321242).

The spelling of 1220212201021 in words is "one trillion, two hundred twenty billion, two hundred twelve million, two hundred one thousand, twenty-one".