21103434021031 has 8 divisors (see below), whose sum is σ = 21449539108400. Its totient is φ = 20757333680640.

The previous prime is 21103434021029. The next prime is 21103434021091. The reversal of 21103434021031 is 13012043430112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21103434021031 - 2¹ = 21103434021029 is a prime.

It is a super-2 number, since 2×21103434021031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21103434020987 and 21103434021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103434021091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8408455 + ... + 10625863.

It is an arithmetic number, because the mean of its divisors is an integer number (2681192388550).

Almost surely, 2^{21103434021031} is an apocalyptic number.

21103434021031 is a deficient number, since it is larger than the sum of its proper divisors (346105087369).

21103434021031 is a wasteful number, since it uses less digits than its factorization.

21103434021031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373489.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21103434021031 its reverse (13012043430112), we get a palindrome (34115477451143).

The spelling of 21103434021031 in words is "twenty-one trillion, one hundred three billion, four hundred thirty-four million, twenty-one thousand, thirty-one".