21494974546 has 8 divisors (see below), whose sum is σ = 33113879820. Its totient is φ = 10457014608.

The previous prime is 21494974517. The next prime is 21494974549. The reversal of 21494974546 is 64547949412.

It can be written as a sum of positive squares in 2 ways, for example, as 21494785321 + 189225 = 146611^2 + 435^2 .

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

It is a super-2 number, since 2×21494974546² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21494974549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145236241 + ... + 145236388.

Almost surely, 2^21494974546 is an apocalyptic number.

21494974546 is a deficient number, since it is larger than the sum of its proper divisors (11618905274).

21494974546 is a wasteful number, since it uses less digits than its factorization.

21494974546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290472668.

The product of its digits is 8709120, while the sum is 55.

The spelling of 21494974546 in words is "twenty-one billion, four hundred ninety-four million, nine hundred seventy-four thousand, five hundred forty-six".