2421045201561 has 16 divisors (see below), whose sum is σ = 3741172466688. Its totient is φ = 1363969126800.

The previous prime is 2421045201451. The next prime is 2421045201563. The reversal of 2421045201561 is 1651025401242.

It is a happy number.

It is not a de Polignac number, because 2421045201561 - 2²² = 2421041007257 is a prime.

It is a super-2 number, since 2×2421045201561² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2421045201563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811884895 + ... + 811887876.

It is an arithmetic number, because the mean of its divisors is an integer number (233823279168).

Almost surely, 2^{2421045201561} is an apocalyptic number.

2421045201561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2421045201561 is a deficient number, since it is larger than the sum of its proper divisors (1320127265127).

2421045201561 is a wasteful number, since it uses less digits than its factorization.

2421045201561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623772852.

The product of its (nonzero) digits is 19200, while the sum is 33.

The spelling of 2421045201561 in words is "two trillion, four hundred twenty-one billion, forty-five million, two hundred one thousand, five hundred sixty-one".