21770534345 has 32 divisors (see below), whose sum is σ = 30256692480. Its totient is φ = 14729414400.

The previous prime is 21770534341. The next prime is 21770534351. The reversal of 21770534345 is 54343507712.

It is a happy number.

It is not a de Polignac number, because 21770534345 - 2² = 21770534341 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21770534341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1025246 + ... + 1046264.

It is an arithmetic number, because the mean of its divisors is an integer number (945521640).

Almost surely, 2^21770534345 is an apocalyptic number.

It is an amenable number.

21770534345 is a deficient number, since it is larger than the sum of its proper divisors (8486158135).

21770534345 is a wasteful number, since it uses less digits than its factorization.

21770534345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21425.

The product of its (nonzero) digits is 352800, while the sum is 41.

The spelling of 21770534345 in words is "twenty-one billion, seven hundred seventy million, five hundred thirty-four thousand, three hundred forty-five".