21122021031 has 8 divisors (see below), whose sum is σ = 28479129840. Its totient is φ = 13923129792.

The previous prime is 21122021029. The next prime is 21122021087. The reversal of 21122021031 is 13012022112.

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

It is not a de Polignac number, because 21122021031 - 2¹ = 21122021029 is a prime.

It is a super-2 number, since 2×21122021031² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122021031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122025031) 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, 39554080 + ... + 39554613.

It is an arithmetic number, because the mean of its divisors is an integer number (3559891230).

Almost surely, 2^21122021031 is an apocalyptic number.

21122021031 is a deficient number, since it is larger than the sum of its proper divisors (7357108809).

21122021031 is an equidigital number, since it uses as much as digits as its factorization.

21122021031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79108785.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21122021031 its reverse (13012022112), we get a palindrome (34134043143).

The spelling of 21122021031 in words is "twenty-one billion, one hundred twenty-two million, twenty-one thousand, thirty-one".