21213212030 has 16 divisors (see below), whose sum is σ = 39500464320. Its totient is φ = 8192688672.

The previous prime is 21213212021. The next prime is 21213212057. The reversal of 21213212030 is 3021231212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36574214 + ... + 36574793.

It is an arithmetic number, because the mean of its divisors is an integer number (2468779020).

Almost surely, 2^21213212030 is an apocalyptic number.

21213212030 is a deficient number, since it is larger than the sum of its proper divisors (18287252290).

21213212030 is a wasteful number, since it uses less digits than its factorization.

21213212030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73149043.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21213212030 its reverse (3021231212), we get a palindrome (24234443242).

The spelling of 21213212030 in words is "twenty-one billion, two hundred thirteen million, two hundred twelve thousand, thirty".