21546349774 has 16 divisors (see below), whose sum is σ = 32657184000. Its totient is φ = 10661207040.

The previous prime is 21546349723. The next prime is 21546349817. The reversal of 21546349774 is 47794364512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72399 + ... + 219850.

It is an arithmetic number, because the mean of its divisors is an integer number (2041074000).

Almost surely, 2^21546349774 is an apocalyptic number.

21546349774 is a deficient number, since it is larger than the sum of its proper divisors (11110834226).

21546349774 is a wasteful number, since it uses less digits than its factorization.

21546349774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292635.

The product of its digits is 5080320, while the sum is 52.

The spelling of 21546349774 in words is "twenty-one billion, five hundred forty-six million, three hundred forty-nine thousand, seven hundred seventy-four".