21420031302 has 48 divisors (see below), whose sum is σ = 48087308880. Its totient is φ = 6886541376.

The previous prime is 21420031291. The next prime is 21420031313. The reversal of 21420031302 is 20313002412.

It is an interprime number because it is at equal distance from previous prime (21420031291) and next prime (21420031313).

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, 133993 + ... + 246564.

It is an arithmetic number, because the mean of its divisors is an integer number (1001818935).

Almost surely, 2^21420031302 is an apocalyptic number.

21420031302 is an abundant number, since it is smaller than the sum of its proper divisors (26667277578).

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

21420031302 is a wasteful number, since it uses less digits than its factorization.

21420031302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380677 (or 380674 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21420031302 its reverse (20313002412), we get a palindrome (41733033714).

The spelling of 21420031302 in words is "twenty-one billion, four hundred twenty million, thirty-one thousand, three hundred two".