20961989942 has 8 divisors (see below), whose sum is σ = 32111984736. Its totient is φ = 10257995032.

The previous prime is 20961989929. The next prime is 20961989957. The reversal of 20961989942 is 24998916902.

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

It is a congruent number.

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, 111499853 + ... + 111500040.

It is an arithmetic number, because the mean of its divisors is an integer number (4013998092).

Almost surely, 2^20961989942 is an apocalyptic number.

20961989942 is a deficient number, since it is larger than the sum of its proper divisors (11149994794).

20961989942 is a wasteful number, since it uses less digits than its factorization.

20961989942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222999942.

The product of its (nonzero) digits is 5038848, while the sum is 59.

The spelling of 20961989942 in words is "twenty billion, nine hundred sixty-one million, nine hundred eighty-nine thousand, nine hundred forty-two".