21351769642 has 8 divisors (see below), whose sum is σ = 36603033696. Its totient is φ = 9150758412.

The previous prime is 21351769627. The next prime is 21351769657. The reversal of 21351769642 is 24696715312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21351769627) and next prime (21351769657).

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

It is a super-4 number, since 4×21351769642⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21351769592 and 21351769601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 762563188 + ... + 762563215.

It is an arithmetic number, because the mean of its divisors is an integer number (4575379212).

Almost surely, 2^21351769642 is an apocalyptic number.

21351769642 is a deficient number, since it is larger than the sum of its proper divisors (15251264054).

21351769642 is a wasteful number, since it uses less digits than its factorization.

21351769642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525126412.

The product of its digits is 544320, while the sum is 46.

The spelling of 21351769642 in words is "twenty-one billion, three hundred fifty-one million, seven hundred sixty-nine thousand, six hundred forty-two".