220021011021 has 16 divisors (see below), whose sum is σ = 354991883904. Its totient is φ = 118330627584.

The previous prime is 220021011019. The next prime is 220021011037. The reversal of 220021011021 is 120110120022.

It is not a de Polignac number, because 220021011021 - 2¹ = 220021011019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220021010988 and 220021011006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021011071) 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, 308152320 + ... + 308153033.

It is an arithmetic number, because the mean of its divisors is an integer number (22186992744).

Almost surely, 2^220021011021 is an apocalyptic number.

220021011021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

220021011021 is a deficient number, since it is larger than the sum of its proper divisors (134970872883).

220021011021 is a wasteful number, since it uses less digits than its factorization.

220021011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616305380.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 220021011021 its reverse (120110120022), we get a palindrome (340131131043).

The spelling of 220021011021 in words is "two hundred twenty billion, twenty-one million, eleven thousand, twenty-one".