21201110109942 has 64 divisors (see below), whose sum is σ = 48675629376000. Its totient is φ = 6030503271936.

The previous prime is 21201110109931. The next prime is 21201110109943. The reversal of 21201110109942 is 24990101110212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201110109943) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13041934 + ... + 14577182.

It is an arithmetic number, because the mean of its divisors is an integer number (760556709000).

Almost surely, 2^{21201110109942} is an apocalyptic number.

21201110109942 is an abundant number, since it is smaller than the sum of its proper divisors (27474519266058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201110109942 is a wasteful number, since it uses less digits than its factorization.

21201110109942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536725.

The product of its (nonzero) digits is 2592, while the sum is 33.

The spelling of 21201110109942 in words is "twenty-one trillion, two hundred one billion, one hundred ten million, one hundred nine thousand, nine hundred forty-two".