221101210981 has 16 divisors (see below), whose sum is σ = 261466934400. Its totient is φ = 182933771328.

The previous prime is 221101210969. The next prime is 221101210987. The reversal of 221101210981 is 189012101122.

It is not a de Polignac number, because 221101210981 - 2²³ = 221092822373 is a prime.

It is a super-2 number, since 2×221101210981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101210987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 673246 + ... + 946288.

It is an arithmetic number, because the mean of its divisors is an integer number (16341683400).

Almost surely, 2^221101210981 is an apocalyptic number.

It is an amenable number.

221101210981 is a deficient number, since it is larger than the sum of its proper divisors (40365723419).

221101210981 is a wasteful number, since it uses less digits than its factorization.

221101210981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277068.

The product of its (nonzero) digits is 576, while the sum is 28.

The spelling of 221101210981 in words is "two hundred twenty-one billion, one hundred one million, two hundred ten thousand, nine hundred eighty-one".