21771917270 has 16 divisors (see below), whose sum is σ = 39194327088. Its totient is φ = 8707683360.

The previous prime is 21771917267. The next prime is 21771917311. The reversal of 21771917270 is 7271917712.

It is a super-2 number, since 2×21771917270² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48389 + ... + 214208.

It is an arithmetic number, because the mean of its divisors is an integer number (2449645443).

Almost surely, 2^21771917270 is an apocalyptic number.

21771917270 is a deficient number, since it is larger than the sum of its proper divisors (17422409818).

21771917270 is a wasteful number, since it uses less digits than its factorization.

21771917270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270895.

The product of its (nonzero) digits is 86436, while the sum is 44.

The spelling of 21771917270 in words is "twenty-one billion, seven hundred seventy-one million, nine hundred seventeen thousand, two hundred seventy".