1321621662 has 16 divisors (see below), whose sum is σ = 2651090832. Its totient is φ = 439232640.

The previous prime is 1321621661. The next prime is 1321621673. The reversal of 1321621662 is 2661261231.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321621661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324789 + ... + 328832.

It is an arithmetic number, because the mean of its divisors is an integer number (165693177).

Almost surely, 2^1321621662 is an apocalyptic number.

1321621662 is an abundant number, since it is smaller than the sum of its proper divisors (1329469170).

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

1321621662 is a wasteful number, since it uses less digits than its factorization.

1321621662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653963.

The product of its digits is 5184, while the sum is 30.

The square root of 1321621662 is about 36354.1147877376. The cubic root of 1321621662 is about 1097.4103439438.

Adding to 1321621662 its reverse (2661261231), we get a palindrome (3982882893).

The spelling of 1321621662 in words is "one billion, three hundred twenty-one million, six hundred twenty-one thousand, six hundred sixty-two".