21227211061 has 12 divisors (see below), whose sum is σ = 24801670368. Its totient is φ = 18114589752.

The previous prime is 21227211023. The next prime is 21227211067. The reversal of 21227211061 is 16011272212.

It is not a de Polignac number, because 21227211061 - 2⁷ = 21227210933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227211067) 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, 943081 + ... + 965326.

It is an arithmetic number, because the mean of its divisors is an integer number (2066805864).

Almost surely, 2^21227211061 is an apocalyptic number.

It is an amenable number.

21227211061 is a deficient number, since it is larger than the sum of its proper divisors (3574459307).

21227211061 is a wasteful number, since it uses less digits than its factorization.

21227211061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908648 (or 1908641 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 21227211061 its reverse (16011272212), we get a palindrome (37238483273).

The spelling of 21227211061 in words is "twenty-one billion, two hundred twenty-seven million, two hundred eleven thousand, sixty-one".