20213421220 has 12 divisors (see below), whose sum is σ = 42448184604. Its totient is φ = 8085368480.

The previous prime is 20213421191. The next prime is 20213421227. The reversal of 20213421220 is 2212431202.

It can be written as a sum of positive squares in 2 ways, for example, as 12166972416 + 8046448804 = 110304^2 + 89702^2 .

It is a super-3 number, since 3×20213421220³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20213421227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505335511 + ... + 505335550.

It is an arithmetic number, because the mean of its divisors is an integer number (3537348717).

Almost surely, 2^20213421220 is an apocalyptic number.

20213421220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20213421220 is an abundant number, since it is smaller than the sum of its proper divisors (22234763384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20213421220 is a wasteful number, since it uses less digits than its factorization.

20213421220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010671070 (or 1010671068 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20213421220 its reverse (2212431202), we get a palindrome (22425852422).

The spelling of 20213421220 in words is "twenty billion, two hundred thirteen million, four hundred twenty-one thousand, two hundred twenty".