101621550551 has 4 divisors (see below), whose sum is σ = 102294541104. Its totient is φ = 100948560000.

The previous prime is 101621550529. The next prime is 101621550557. The reversal of 101621550551 is 155055126101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155055126101 = 53 ⋅2925568417.

It is a cyclic number.

It is not a de Polignac number, because 101621550551 - 2¹⁴ = 101621534167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101621550557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336495050 + ... + 336495351.

It is an arithmetic number, because the mean of its divisors is an integer number (25573635276).

Almost surely, 2^101621550551 is an apocalyptic number.

101621550551 is a deficient number, since it is larger than the sum of its proper divisors (672990553).

101621550551 is an equidigital number, since it uses as much as digits as its factorization.

101621550551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672990552.

The product of its (nonzero) digits is 7500, while the sum is 32.

Adding to 101621550551 its reverse (155055126101), we get a palindrome (256676676652).

The spelling of 101621550551 in words is "one hundred one billion, six hundred twenty-one million, five hundred fifty thousand, five hundred fifty-one".