101553421520 has 160 divisors (see below), whose sum is σ = 245560533120. Its totient is φ = 39029760000.

The previous prime is 101553421471. The next prime is 101553421531. The reversal of 101553421520 is 25124355101.

It is a super-2 number, since 2×101553421520² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96624995 + ... + 96626045.

It is an arithmetic number, because the mean of its divisors is an integer number (1534753332).

Almost surely, 2^101553421520 is an apocalyptic number.

101553421520 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 101553421520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122780266560).

101553421520 is an abundant number, since it is smaller than the sum of its proper divisors (144007111600).

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

101553421520 is a wasteful number, since it uses less digits than its factorization.

101553421520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525 (or 1519 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 101553421520 its reverse (25124355101), we get a palindrome (126677776621).

The spelling of 101553421520 in words is "one hundred one billion, five hundred fifty-three million, four hundred twenty-one thousand, five hundred twenty".