21140420202 has 48 divisors (see below), whose sum is σ = 51818955552. Its totient is φ = 6406186320.

The previous prime is 21140420201. The next prime is 21140420219. The reversal of 21140420202 is 20202404112.

21140420202 is a `hidden beast` number, since 2 + 1 + 1 + 40 + 420 + 202 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21140420201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1971873 + ... + 1982564.

It is an arithmetic number, because the mean of its divisors is an integer number (1079561574).

Almost surely, 2^21140420202 is an apocalyptic number.

21140420202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21140420202 is an abundant number, since it is smaller than the sum of its proper divisors (30678535350).

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

21140420202 is a wasteful number, since it uses less digits than its factorization.

21140420202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954465 (or 3954453 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21140420202 its reverse (20202404112), we get a palindrome (41342824314).

The spelling of 21140420202 in words is "twenty-one billion, one hundred forty million, four hundred twenty thousand, two hundred two".