21540076958 has 8 divisors (see below), whose sum is σ = 32719104480. Its totient is φ = 10633708800.

The previous prime is 21540076951. The next prime is 21540076963. The reversal of 21540076958 is 85967004512.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21540076951) 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, 68164643 + ... + 68164958.

It is an arithmetic number, because the mean of its divisors is an integer number (4089888060).

Almost surely, 2^21540076958 is an apocalyptic number.

21540076958 is a deficient number, since it is larger than the sum of its proper divisors (11179027522).

21540076958 is a wasteful number, since it uses less digits than its factorization.

21540076958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136329682.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 21540076958 in words is "twenty-one billion, five hundred forty million, seventy-six thousand, nine hundred fifty-eight".