21102022011 has 32 divisors (see below), whose sum is σ = 32639321088. Its totient is φ = 11878070400.

The previous prime is 21102022009. The next prime is 21102022031. The reversal of 21102022011 is 11022020112.

It is not a de Polignac number, because 21102022011 - 2¹ = 21102022009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102022031) 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, 392586 + ... + 443088.

It is an arithmetic number, because the mean of its divisors is an integer number (1019978784).

Almost surely, 2^21102022011 is an apocalyptic number.

21102022011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21102022011 is a deficient number, since it is larger than the sum of its proper divisors (11537299077).

21102022011 is a wasteful number, since it uses less digits than its factorization.

21102022011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50811.

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

Adding to 21102022011 its reverse (11022020112), we get a palindrome (32124042123).

The spelling of 21102022011 in words is "twenty-one billion, one hundred two million, twenty-two thousand, eleven".