106898610551021 has 4 divisors (see below), whose sum is σ = 108915565467132. Its totient is φ = 104881655634912.

The previous prime is 106898610551003. The next prime is 106898610551027. The reversal of 106898610551021 is 120155016898601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53873926492996 + 53024684058025 = 7339886^2 + 7281805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-106898610551021 is a prime.

It is a super-2 number, since 2×106898610551021² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 2016954916057 = 106898610551021 / (1 + 0 + 6 + 8 + 9 + 8 + 6 + 1 + 0 + 5 + 5 + 1 + 0 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106898610551027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1008477457976 + ... + 1008477458081.

It is an arithmetic number, because the mean of its divisors is an integer number (27228891366783).

Almost surely, 2^{106898610551021} is an apocalyptic number.

It is an amenable number.

106898610551021 is a deficient number, since it is larger than the sum of its proper divisors (2016954916111).

106898610551021 is an equidigital number, since it uses as much as digits as its factorization.

106898610551021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016954916110.

The product of its (nonzero) digits is 1036800, while the sum is 53.

The spelling of 106898610551021 in words is "one hundred six trillion, eight hundred ninety-eight billion, six hundred ten million, five hundred fifty-one thousand, twenty-one".