21697134470 has 32 divisors (see below), whose sum is σ = 42611770656. Its totient is φ = 7888665600.

The previous prime is 21697134467. The next prime is 21697134491. The reversal of 21697134470 is 7443179612.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1056500 + ... + 1076840.

It is an arithmetic number, because the mean of its divisors is an integer number (1331617833).

Almost surely, 2^21697134470 is an apocalyptic number.

21697134470 is a deficient number, since it is larger than the sum of its proper divisors (20914636186).

21697134470 is a wasteful number, since it uses less digits than its factorization.

21697134470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30056.

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 21697134470 in words is "twenty-one billion, six hundred ninety-seven million, one hundred thirty-four thousand, four hundred seventy".