21021212030 has 48 divisors (see below), whose sum is σ = 46825975584. Its totient is φ = 6652863360.

The previous prime is 21021211987. The next prime is 21021212041. The reversal of 21021212030 is 3021212012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21021211996 and 21021212014.

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, 876641 + ... + 900300.

It is an arithmetic number, because the mean of its divisors is an integer number (975541158).

Almost surely, 2^21021212030 is an apocalyptic number.

21021212030 is an abundant number, since it is smaller than the sum of its proper divisors (25804763554).

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

21021212030 is a wasteful number, since it uses less digits than its factorization.

21021212030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776981 (or 1776968 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21021212030 its reverse (3021212012), we get a palindrome (24042424042).

The spelling of 21021212030 in words is "twenty-one billion, twenty-one million, two hundred twelve thousand, thirty".