13421402420 has 48 divisors (see below), whose sum is σ = 30871970640. Its totient is φ = 4878526464.

The previous prime is 13421402411. The next prime is 13421402429. The reversal of 13421402420 is 2420412431.

It is an interprime number because it is at equal distance from previous prime (13421402411) and next prime (13421402429).

It can be written as a sum of positive squares in 8 ways, for example, as 278155684 + 13143246736 = 16678^2 + 114644^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13421402429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 670739 + ... + 690458.

It is an arithmetic number, because the mean of its divisors is an integer number (643166055).

Almost surely, 2^13421402420 is an apocalyptic number.

13421402420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13421402420 is an abundant number, since it is smaller than the sum of its proper divisors (17450568220).

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

13421402420 is a wasteful number, since it uses less digits than its factorization.

13421402420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361252 (or 1361250 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 13421402420 its reverse (2420412431), we get a palindrome (15841814851).

The spelling of 13421402420 in words is "thirteen billion, four hundred twenty-one million, four hundred two thousand, four hundred twenty".