21022100402 has 4 divisors (see below), whose sum is σ = 31533150606. Its totient is φ = 10511050200.

The previous prime is 21022100399. The next prime is 21022100413. The reversal of 21022100402 is 20400122012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14134594321 + 6887506081 = 118889^2 + 82991^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255525099 + ... + 5255525102.

Almost surely, 2^21022100402 is an apocalyptic number.

21022100402 is a deficient number, since it is larger than the sum of its proper divisors (10511050204).

21022100402 is a wasteful number, since it uses less digits than its factorization.

21022100402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10511050203.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21022100402 its reverse (20400122012), we get a palindrome (41422222414).

The spelling of 21022100402 in words is "twenty-one billion, twenty-two million, one hundred thousand, four hundred two".