21020220022011 has 16 divisors (see below), whose sum is σ = 32030880249600. Its totient is φ = 12011528503008.

The previous prime is 21020220021949. The next prime is 21020220022049. The reversal of 21020220022011 is 11022002202012.

It is not a de Polignac number, because 21020220022011 - 2⁶ = 21020220021947 is a prime.

It is a super-3 number, since 3×21020220022011³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020220022411) 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, 13589680 + ... + 15057218.

It is an arithmetic number, because the mean of its divisors is an integer number (2001930015600).

Almost surely, 2^{21020220022011} is an apocalyptic number.

21020220022011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21020220022011 is a deficient number, since it is larger than the sum of its proper divisors (11010660227589).

21020220022011 is a wasteful number, since it uses less digits than its factorization.

21020220022011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149618.

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

Adding to 21020220022011 its reverse (11022002202012), we get a palindrome (32042222224023).

The spelling of 21020220022011 in words is "twenty-one trillion, twenty billion, two hundred twenty million, twenty-two thousand, eleven".