21771743034 has 16 divisors (see below), whose sum is σ = 43646919840. Its totient is φ = 7240008720.

The previous prime is 21771743033. The next prime is 21771743051. The reversal of 21771743034 is 43034717712.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21771742983 and 21771743001.

It is not an unprimeable number, because it can be changed into a prime (21771743033) 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, 4307004 + ... + 4312055.

It is an arithmetic number, because the mean of its divisors is an integer number (2727932490).

Almost surely, 2^21771743034 is an apocalyptic number.

21771743034 is an abundant number, since it is smaller than the sum of its proper divisors (21875176806).

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

21771743034 is a wasteful number, since it uses less digits than its factorization.

21771743034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8619485.

The product of its (nonzero) digits is 98784, while the sum is 39.

The spelling of 21771743034 in words is "twenty-one billion, seven hundred seventy-one million, seven hundred forty-three thousand, thirty-four".