21212203011 has 8 divisors (see below), whose sum is σ = 28298807040. Its totient is φ = 14133533832.

The previous prime is 21212203009. The next prime is 21212203073. The reversal of 21212203011 is 11030221212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21212203011 - 2¹ = 21212203009 is a prime.

It is a super-2 number, since 2×21212203011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212203081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1977471 + ... + 1988168.

It is an arithmetic number, because the mean of its divisors is an integer number (3537350880).

Almost surely, 2^21212203011 is an apocalyptic number.

21212203011 is a deficient number, since it is larger than the sum of its proper divisors (7086604029).

21212203011 is a wasteful number, since it uses less digits than its factorization.

21212203011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3967425.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21212203011 its reverse (11030221212), we get a palindrome (32242424223).

The spelling of 21212203011 in words is "twenty-one billion, two hundred twelve million, two hundred three thousand, eleven".