21222460077 has 32 divisors (see below), whose sum is σ = 36659589120. Its totient is φ = 10605090240.

The previous prime is 21222460073. The next prime is 21222460081. The reversal of 21222460077 is 77006422212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21222460073) and next prime (21222460081).

It is not a de Polignac number, because 21222460077 - 2² = 21222460073 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222460073) 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, 2040549 + ... + 2050922.

It is an arithmetic number, because the mean of its divisors is an integer number (1145612160).

Almost surely, 2^21222460077 is an apocalyptic number.

It is an amenable number.

21222460077 is a deficient number, since it is larger than the sum of its proper divisors (15437129043).

21222460077 is a wasteful number, since it uses less digits than its factorization.

21222460077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091513.

The product of its (nonzero) digits is 18816, while the sum is 33.

Adding to 21222460077 its reverse (77006422212), we get a palindrome (98228882289).

The spelling of 21222460077 in words is "twenty-one billion, two hundred twenty-two million, four hundred sixty thousand, seventy-seven".