1621463453100 has 216 divisors, whose sum is σ = 5208506634240. Its totient is φ = 421669248000.

The previous prime is 1621463453017. The next prime is 1621463453101. The reversal of 1621463453100 is 13543641261.

1621463453100 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 4 + 634 + 5 + 3 + 10 + 0 = 666.

It is a super-2 number, since 2×1621463453100² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1621463453101) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 105563221 + ... + 105578579.

It is an arithmetic number, because the mean of its divisors is an integer number (24113456640).

Almost surely, 2^{1621463453100} is an apocalyptic number.

1621463453100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621463453100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2604253317120).

1621463453100 is an abundant number, since it is smaller than the sum of its proper divisors (3587043181140).

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

1621463453100 is a wasteful number, since it uses less digits than its factorization.

1621463453100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18281 (or 18271 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 1621463453100 in words is "one trillion, six hundred twenty-one billion, four hundred sixty-three million, four hundred fifty-three thousand, one hundred".