21003131214 has 48 divisors (see below), whose sum is σ = 51138071712. Its totient is φ = 6181521984.

The previous prime is 21003131207. The next prime is 21003131239. The reversal of 21003131214 is 41213130012.

It is a super-2 number, since 2×21003131214² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1945857 + ... + 1956620.

It is an arithmetic number, because the mean of its divisors is an integer number (1065376494).

Almost surely, 2^21003131214 is an apocalyptic number.

21003131214 is an abundant number, since it is smaller than the sum of its proper divisors (30134940498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21003131214 is a wasteful number, since it uses less digits than its factorization.

21003131214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3902521 (or 3902518 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21003131214 its reverse (41213130012), we get a palindrome (62216261226).

The spelling of 21003131214 in words is "twenty-one billion, three million, one hundred thirty-one thousand, two hundred fourteen".