21031022203073 has 2 divisors, whose sum is σ = 21031022203074. Its totient is φ = 21031022203072.

The previous prime is 21031022202991. The next prime is 21031022203127. The reversal of 21031022203073 is 37030222013012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12422361064369 + 8608661138704 = 3524537^2 + 2934052^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031022203073 - 2¹⁶ = 21031022137537 is a prime.

It is a super-2 number, since 2×21031022203073² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21031022203973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515511101536 + 10515511101537.

It is an arithmetic number, because the mean of its divisors is an integer number (10515511101537).

Almost surely, 2^{21031022203073} is an apocalyptic number.

It is an amenable number.

21031022203073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031022203073 is an equidigital number, since it uses as much as digits as its factorization.

21031022203073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 26.

Adding to 21031022203073 its reverse (37030222013012), we get a palindrome (58061244216085).

The spelling of 21031022203073 in words is "twenty-one trillion, thirty-one billion, twenty-two million, two hundred three thousand, seventy-three".