21774036606 has 48 divisors (see below), whose sum is σ = 50846466960. Its totient is φ = 6198003840.

The previous prime is 21774036601. The next prime is 21774036617. The reversal of 21774036606 is 60663047712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21774036601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58575 + ... + 216746.

It is an arithmetic number, because the mean of its divisors is an integer number (1059301395).

Almost surely, 2^21774036606 is an apocalyptic number.

21774036606 is an abundant number, since it is smaller than the sum of its proper divisors (29072430354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21774036606 is a wasteful number, since it uses less digits than its factorization.

21774036606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275609 (or 275602 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 42.

The spelling of 21774036606 in words is "twenty-one billion, seven hundred seventy-four million, thirty-six thousand, six hundred six".