21701221174906 has 48 divisors (see below), whose sum is σ = 41295410634240. Its totient is φ = 8476426314720.

The previous prime is 21701221174819. The next prime is 21701221174907. The reversal of 21701221174906 is 60947112210712.

It is not an unprimeable number, because it can be changed into a prime (21701221174907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107709010 + ... + 107910301.

It is an arithmetic number, because the mean of its divisors is an integer number (860321054880).

Almost surely, 2^{21701221174906} is an apocalyptic number.

21701221174906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21701221174906 is a deficient number, since it is larger than the sum of its proper divisors (19594189459334).

21701221174906 is a wasteful number, since it uses less digits than its factorization.

21701221174906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215619419 (or 215619412 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 43.

The spelling of 21701221174906 in words is "twenty-one trillion, seven hundred one billion, two hundred twenty-one million, one hundred seventy-four thousand, nine hundred six".