221012469 has 10 divisors (see below), whose sum is σ = 330154550. Its totient is φ = 147341592.

The previous prime is 221012453. The next prime is 221012489. The reversal of 221012469 is 964210122.

It can be written as a sum of positive squares in only one way, i.e., 171479025 + 49533444 = 13095^2 + 7038^2 .

It is not a de Polignac number, because 221012469 - 2⁴ = 221012453 is a prime.

It is a super-2 number, since 2×221012469² = 97693022906951922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012489) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1364194 + ... + 1364355.

It is an arithmetic number, because the mean of its divisors is an integer number (33015455).

Almost surely, 2^221012469 is an apocalyptic number.

It is an amenable number.

221012469 is a deficient number, since it is larger than the sum of its proper divisors (109142081).

221012469 is an equidigital number, since it uses as much as digits as its factorization.

221012469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2728561 (or 2728552 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 221012469 is about 14866.4881192567. The cubic root of 221012469 is about 604.6057299561.

The spelling of 221012469 in words is "two hundred twenty-one million, twelve thousand, four hundred sixty-nine".