1220206002021 has 6 divisors (see below), whose sum is σ = 1762519780710. Its totient is φ = 813470668008.

The previous prime is 1220206001969. The next prime is 1220206002091. The reversal of 1220206002021 is 1202006020221.

1220206002021 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 20 + 600 + 20 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1216412673921 + 3793328100 = 1102911^2 + 61590^2 .

It is not a de Polignac number, because 1220206002021 - 2¹⁵ = 1220205969253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220206001985 and 1220206002003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220206002091) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67789222326 + ... + 67789222343.

It is an arithmetic number, because the mean of its divisors is an integer number (293753296785).

Almost surely, 2^{1220206002021} is an apocalyptic number.

It is an amenable number.

1220206002021 is a deficient number, since it is larger than the sum of its proper divisors (542313778689).

1220206002021 is a wasteful number, since it uses less digits than its factorization.

1220206002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135578444675 (or 135578444672 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The spelling of 1220206002021 in words is "one trillion, two hundred twenty billion, two hundred six million, two thousand, twenty-one".