221291010 has 48 divisors (see below), whose sum is σ = 576201600. Its totient is φ = 58924320.

The previous prime is 221291009. The next prime is 221291033. The reversal of 221291010 is 10192122.

It is a super-2 number, since 2×221291010² = 97939422213640200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80641 + ... + 83339.

It is an arithmetic number, because the mean of its divisors is an integer number (12004200).

Almost surely, 2^221291010 is an apocalyptic number.

221291010 is an abundant number, since it is smaller than the sum of its proper divisors (354910590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221291010 is a wasteful number, since it uses less digits than its factorization.

221291010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3623 (or 3620 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 221291010 is about 14875.8532528390. The cubic root of 221291010 is about 604.8596172702.

The spelling of 221291010 in words is "two hundred twenty-one million, two hundred ninety-one thousand, ten".