21620546204242 has 16 divisors (see below), whose sum is σ = 32621256084672. Its totient is φ = 10746909699120.

The previous prime is 21620546204219. The next prime is 21620546204293. The reversal of 21620546204242 is 24240264502612.

It is a junction number, because it is equal to n+sod(n) for n = 21620546204195 and 21620546204204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28505913 + ... + 29254540.

It is an arithmetic number, because the mean of its divisors is an integer number (2038828505292).

Almost surely, 2^{21620546204242} is an apocalyptic number.

21620546204242 is a deficient number, since it is larger than the sum of its proper divisors (11000709880430).

21620546204242 is a wasteful number, since it uses less digits than its factorization.

21620546204242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57761553.

The product of its (nonzero) digits is 368640, while the sum is 40.

The spelling of 21620546204242 in words is "twenty-one trillion, six hundred twenty billion, five hundred forty-six million, two hundred four thousand, two hundred forty-two".