21211101021031 has 12 divisors (see below), whose sum is σ = 22756696474120. Its totient is φ = 19715581435680.

The previous prime is 21211101021017. The next prime is 21211101021037. The reversal of 21211101021031 is 13012010111212.

It is a happy number.

It is not a de Polignac number, because 21211101021031 - 2⁹ = 21211101020519 is a prime.

It is a super-2 number, since 2×21211101021031² (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 = 21211101020996 and 21211101021014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211101021037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198660360 + ... + 198767101.

Almost surely, 2^{21211101021031} is an apocalyptic number.

21211101021031 is a deficient number, since it is larger than the sum of its proper divisors (1545595453089).

21211101021031 is an equidigital number, since it uses as much as digits as its factorization.

21211101021031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397427586 (or 397427533 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21211101021031 its reverse (13012010111212), we get a palindrome (34223111132243).

The spelling of 21211101021031 in words is "twenty-one trillion, two hundred eleven billion, one hundred one million, twenty-one thousand, thirty-one".