221020212021 has 32 divisors (see below), whose sum is σ = 340886396928. Its totient is φ = 124770784320.

The previous prime is 221020212019. The next prime is 221020212107. The reversal of 221020212021 is 120212020122.

It is not a de Polignac number, because 221020212021 - 2¹ = 221020212019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020222021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 433335 + ... + 793611.

It is an arithmetic number, because the mean of its divisors is an integer number (10652699904).

Almost surely, 2^221020212021 is an apocalyptic number.

221020212021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221020212021 is a deficient number, since it is larger than the sum of its proper divisors (119866184907).

221020212021 is a wasteful number, since it uses less digits than its factorization.

221020212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360641.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221020212021 its reverse (120212020122), we get a palindrome (341232232143).

The spelling of 221020212021 in words is "two hundred twenty-one billion, twenty million, two hundred twelve thousand, twenty-one".