21767461428 has 48 divisors (see below), whose sum is σ = 51689974784. Its totient is φ = 7127952480.

The previous prime is 21767461423. The next prime is 21767461459. The reversal of 21767461428 is 82416476712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21767461421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258183 + ... + 331953.

Almost surely, 2^21767461428 is an apocalyptic number.

It is an amenable number.

21767461428 is an abundant number, since it is smaller than the sum of its proper divisors (29922513356).

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

21767461428 is a wasteful number, since it uses less digits than its factorization.

21767461428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74212 (or 74210 counting only the distinct ones).

The product of its digits is 903168, while the sum is 48.

The spelling of 21767461428 in words is "twenty-one billion, seven hundred sixty-seven million, four hundred sixty-one thousand, four hundred twenty-eight".