21709475754 has 8 divisors (see below), whose sum is σ = 43418951520. Its totient is φ = 7236491916.

The previous prime is 21709475743. The next prime is 21709475783. The reversal of 21709475754 is 45757490712.

It is a sphenic number, since it is the product of 3 distinct primes.

21709475754 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21709475697 and 21709475706.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1809122974 + ... + 1809122985.

It is an arithmetic number, because the mean of its divisors is an integer number (5427368940).

Almost surely, 2^21709475754 is an apocalyptic number.

21709475754 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21709475754 is a wasteful number, since it uses less digits than its factorization.

21709475754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3618245964.

The product of its (nonzero) digits is 2469600, while the sum is 51.

The spelling of 21709475754 in words is "twenty-one billion, seven hundred nine million, four hundred seventy-five thousand, seven hundred fifty-four".