21222740061 has 12 divisors (see below), whose sum is σ = 32268493920. Its totient is φ = 13403835720.

The previous prime is 21222740059. The next prime is 21222740083. The reversal of 21222740061 is 16004722212.

It is not a de Polignac number, because 21222740061 - 2¹ = 21222740059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222740261) 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, 62054625 + ... + 62054966.

It is an arithmetic number, because the mean of its divisors is an integer number (2689041160).

Almost surely, 2^21222740061 is an apocalyptic number.

It is an amenable number.

21222740061 is a deficient number, since it is larger than the sum of its proper divisors (11045753859).

21222740061 is a wasteful number, since it uses less digits than its factorization.

21222740061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124109616 (or 124109613 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The spelling of 21222740061 in words is "twenty-one billion, two hundred twenty-two million, seven hundred forty thousand, sixty-one".