21213101031 has 8 divisors (see below), whose sum is σ = 28290593664. Its totient is φ = 14138837880.

The previous prime is 21213101009. The next prime is 21213101053. The reversal of 21213101031 is 13010131212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21213101009) and next prime (21213101053).

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

It is not a de Polignac number, because 21213101031 - 2⁵ = 21213100999 is a prime.

It is a super-2 number, since 2×21213101031² (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 21213101031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213101131) 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, 792001 + ... + 818346.

It is an arithmetic number, because the mean of its divisors is an integer number (3536324208).

Almost surely, 2^21213101031 is an apocalyptic number.

21213101031 is a deficient number, since it is larger than the sum of its proper divisors (7077492633).

21213101031 is a wasteful number, since it uses less digits than its factorization.

21213101031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1614741.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21213101031 its reverse (13010131212), we get a palindrome (34223232243).

The spelling of 21213101031 in words is "twenty-one billion, two hundred thirteen million, one hundred one thousand, thirty-one".