21021031002101 has 6 divisors (see below), whose sum is σ = 22762418185890. Its totient is φ = 19404028617168.

The previous prime is 21021031002031. The next prime is 21021031002121. The reversal of 21021031002101 is 10120013012012.

It can be written as a sum of positive squares in 3 ways, for example, as 1924742797201 + 19096288204900 = 1387351^2 + 4369930^2 .

It is not a de Polignac number, because 21021031002101 - 2²² = 21021026807797 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 (21021031002121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62192399246 + ... + 62192399583.

It is an arithmetic number, because the mean of its divisors is an integer number (3793736364315).

Almost surely, 2^{21021031002101} is an apocalyptic number.

It is an amenable number.

21021031002101 is a deficient number, since it is larger than the sum of its proper divisors (1741387183789).

21021031002101 is a wasteful number, since it uses less digits than its factorization.

21021031002101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124384798855 (or 124384798842 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21021031002101 its reverse (10120013012012), we get a palindrome (31141044014113).

The spelling of 21021031002101 in words is "twenty-one trillion, twenty-one billion, thirty-one million, two thousand, one hundred one".