103121123021 has 16 divisors (see below), whose sum is σ = 124881179904. Its totient is φ = 83126179584.

The previous prime is 103121123011. The next prime is 103121123033. The reversal of 103121123021 is 120321121301.

It is not a de Polignac number, because 103121123021 - 2³⁴ = 85941253837 is a prime.

It is a super-2 number, since 2×103121123021² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103121123011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177470 + ... + 487583.

It is an arithmetic number, because the mean of its divisors is an integer number (7805073744).

Almost surely, 2^103121123021 is an apocalyptic number.

It is an amenable number.

103121123021 is a deficient number, since it is larger than the sum of its proper divisors (21760056883).

103121123021 is a wasteful number, since it uses less digits than its factorization.

103121123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666380.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 103121123021 its reverse (120321121301), we get a palindrome (223442244322).

The spelling of 103121123021 in words is "one hundred three billion, one hundred twenty-one million, one hundred twenty-three thousand, twenty-one".