21657229070 has 64 divisors (see below), whose sum is σ = 40400363520. Its totient is φ = 8353661568.

The previous prime is 21657229051. The next prime is 21657229079. The reversal of 21657229070 is 7092275612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21657229079) 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, 17621216 + ... + 17622444.

It is an arithmetic number, because the mean of its divisors is an integer number (631255680).

Almost surely, 2^21657229070 is an apocalyptic number.

21657229070 is a deficient number, since it is larger than the sum of its proper divisors (18743134450).

21657229070 is a wasteful number, since it uses less digits than its factorization.

21657229070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 21657229070 in words is "twenty-one billion, six hundred fifty-seven million, two hundred twenty-nine thousand, seventy".