21142100402 has 8 divisors (see below), whose sum is σ = 32159814912. Its totient is φ = 10422162100.

The previous prime is 21142100389. The next prime is 21142100407. The reversal of 21142100402 is 20400124112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21142100407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74443874 + ... + 74444157.

It is an arithmetic number, because the mean of its divisors is an integer number (4019976864).

Almost surely, 2^21142100402 is an apocalyptic number.

21142100402 is a deficient number, since it is larger than the sum of its proper divisors (11017714510).

21142100402 is a wasteful number, since it uses less digits than its factorization.

21142100402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148888104.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21142100402 its reverse (20400124112), we get a palindrome (41542224514).

The spelling of 21142100402 in words is "twenty-one billion, one hundred forty-two million, one hundred thousand, four hundred two".