1601153216421 has 8 divisors (see below), whose sum is σ = 2328950133024. Its totient is φ = 970395888720.

The previous prime is 1601153216419. The next prime is 1601153216441. The reversal of 1601153216421 is 1246123511061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1601153216421 - 2¹ = 1601153216419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 48519794437 = 1601153216421 / (1 + 6 + 0 + 1 + 1 + 5 + 3 + 2 + 1 + 6 + 4 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601153216401) 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, 24259897186 + ... + 24259897251.

It is an arithmetic number, because the mean of its divisors is an integer number (291118766628).

Almost surely, 2^{1601153216421} is an apocalyptic number.

1601153216421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1601153216421 is a deficient number, since it is larger than the sum of its proper divisors (727796916603).

1601153216421 is a wasteful number, since it uses less digits than its factorization.

1601153216421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48519794451.

The product of its (nonzero) digits is 8640, while the sum is 33.

Adding to 1601153216421 its reverse (1246123511061), we get a palindrome (2847276727482).

The spelling of 1601153216421 in words is "one trillion, six hundred one billion, one hundred fifty-three million, two hundred sixteen thousand, four hundred twenty-one".