53221690 has 32 divisors (see below), whose sum is σ = 98703360. Its totient is φ = 20649600.

The previous prime is 53221687. The next prime is 53221691. The reversal of 53221690 is 9612235.

It is a super-2 number, since 2×53221690² = 5665096572912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (53221691) 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, 110871 + ... + 111349.

It is an arithmetic number, because the mean of its divisors is an integer number (3084480).

Almost surely, 2^53221690 is an apocalyptic number.

53221690 is a deficient number, since it is larger than the sum of its proper divisors (45481670).

53221690 is a wasteful number, since it uses less digits than its factorization.

53221690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 53221690 is about 7295.3197325409. The cubic root of 53221690 is about 376.1515770711.

It can be divided in two parts, 532 and 21690, that added together give a palindrome (22222).

The spelling of 53221690 in words is "fifty-three million, two hundred twenty-one thousand, six hundred ninety".