1621164121332 has 72 divisors (see below), whose sum is σ = 4400785591776. Its totient is φ = 463138909632.

The previous prime is 1621164121331. The next prime is 1621164121373. The reversal of 1621164121332 is 2331214611261.

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

It is a junction number, because it is equal to n+sod(n) for n = 1621164121293 and 1621164121302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621164121331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5382358 + ... + 5675570.

It is an arithmetic number, because the mean of its divisors is an integer number (61122022108).

Almost surely, 2^{1621164121332} is an apocalyptic number.

1621164121332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621164121332 is an abundant number, since it is smaller than the sum of its proper divisors (2779621470444).

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

1621164121332 is a wasteful number, since it uses less digits than its factorization.

1621164121332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302637 (or 302628 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

Adding to 1621164121332 its reverse (2331214611261), we get a palindrome (3952378732593).

The spelling of 1621164121332 in words is "one trillion, six hundred twenty-one billion, one hundred sixty-four million, one hundred twenty-one thousand, three hundred thirty-two".