21420211302 has 24 divisors (see below), whose sum is σ = 53040523536. Its totient is φ = 6120060336.

The previous prime is 21420211301. The next prime is 21420211303. The reversal of 21420211302 is 20311202412.

It is a happy number.

21420211302 is a `hidden beast` number, since 2 + 1 + 420 + 211 + 30 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21420211301) and next prime (21420211303).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420211301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85000713 + ... + 85000964.

It is an arithmetic number, because the mean of its divisors is an integer number (2210021814).

Almost surely, 2^21420211302 is an apocalyptic number.

21420211302 is an abundant number, since it is smaller than the sum of its proper divisors (31620312234).

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

21420211302 is a wasteful number, since it uses less digits than its factorization.

21420211302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170001692 (or 170001689 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21420211302 its reverse (20311202412), we get a palindrome (41731413714).

The spelling of 21420211302 in words is "twenty-one billion, four hundred twenty million, two hundred eleven thousand, three hundred two".