21771461223 has 12 divisors (see below), whose sum is σ = 31448952288. Its totient is φ = 14513713920.

The previous prime is 21771461221. The next prime is 21771461269. The reversal of 21771461223 is 32216417712.

21771461223 is a `hidden beast` number, since 2 + 1 + 7 + 7 + 14 + 612 + 23 = 666.

It is not a de Polignac number, because 21771461223 - 2¹ = 21771461221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21771461221) 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, 370503 + ... + 425223.

It is an arithmetic number, because the mean of its divisors is an integer number (2620746024).

Almost surely, 2^21771461223 is an apocalyptic number.

21771461223 is a deficient number, since it is larger than the sum of its proper divisors (9677491065).

21771461223 is a wasteful number, since it uses less digits than its factorization.

21771461223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98934 (or 98931 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

Adding to 21771461223 its reverse (32216417712), we get a palindrome (53987878935).

The spelling of 21771461223 in words is "twenty-one billion, seven hundred seventy-one million, four hundred sixty-one thousand, two hundred twenty-three".