21771063006 has 32 divisors (see below), whose sum is σ = 54286288128. Its totient is φ = 5654821440.

The previous prime is 21771062977. The next prime is 21771063031. The reversal of 21771063006 is 60036017712.

It is a super-2 number, since 2×21771063006² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23561295 + ... + 23562218.

It is an arithmetic number, because the mean of its divisors is an integer number (1696446504).

Almost surely, 2^21771063006 is an apocalyptic number.

21771063006 is an abundant number, since it is smaller than the sum of its proper divisors (32515225122).

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

21771063006 is a wasteful number, since it uses less digits than its factorization.

21771063006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47123536.

The product of its (nonzero) digits is 10584, while the sum is 33.

The spelling of 21771063006 in words is "twenty-one billion, seven hundred seventy-one million, sixty-three thousand, six".