21698903494 has 8 divisors (see below), whose sum is σ = 32553031968. Its totient is φ = 10847892840.

The previous prime is 21698903491. The next prime is 21698903519. The reversal of 21698903494 is 49430989612.

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

It is a super-3 number, since 3×21698903494³ (a number of 32 digits) contains 333 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21698903491) 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, 761977 + ... + 789940.

It is an arithmetic number, because the mean of its divisors is an integer number (4069128996).

Almost surely, 2^21698903494 is an apocalyptic number.

21698903494 is a deficient number, since it is larger than the sum of its proper divisors (10854128474).

21698903494 is a wasteful number, since it uses less digits than its factorization.

21698903494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558910.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 21698903494 in words is "twenty-one billion, six hundred ninety-eight million, nine hundred three thousand, four hundred ninety-four".