21400069402 has 8 divisors (see below), whose sum is σ = 32460779700. Its totient is φ = 10579809504.

The previous prime is 21400069393. The next prime is 21400069403. The reversal of 21400069402 is 20496000412.

It can be written as a sum of positive squares in 2 ways, for example, as 18327473641 + 3072595761 = 135379^2 + 55431^2 .

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 (21400069403) 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, 60112377 + ... + 60112732.

Almost surely, 2^21400069402 is an apocalyptic number.

21400069402 is a deficient number, since it is larger than the sum of its proper divisors (11060710298).

21400069402 is a wasteful number, since it uses less digits than its factorization.

21400069402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120225200.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 21400069402 its reverse (20496000412), we get a palindrome (41896069814).

The spelling of 21400069402 in words is "twenty-one billion, four hundred million, sixty-nine thousand, four hundred two".