220021011 has 12 divisors (see below), whose sum is σ = 363209392. Its totient is φ = 125726256.

The previous prime is 220021003. The next prime is 220021019. The reversal of 220021011 is 110120022.

It is an interprime number because it is at equal distance from previous prime (220021003) and next prime (220021019).

It is not a de Polignac number, because 220021011 - 2³ = 220021003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 220020984 and 220021002.

It is not an unprimeable number, because it can be changed into a prime (220021019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1746136 + ... + 1746261.

Almost surely, 2^220021011 is an apocalyptic number.

220021011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

220021011 is a deficient number, since it is larger than the sum of its proper divisors (143188381).

220021011 is a wasteful number, since it uses less digits than its factorization.

220021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3492410 (or 3492407 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 220021011 is about 14833.1052379466. The cubic root of 220021011 is about 603.7002911635.

Adding to 220021011 its reverse (110120022), we get a palindrome (330141033).

The spelling of 220021011 in words is "two hundred twenty million, twenty-one thousand, eleven".