21402221241 has 16 divisors (see below), whose sum is σ = 29735798400. Its totient is φ = 13675579008.

The previous prime is 21402221231. The next prime is 21402221353. The reversal of 21402221241 is 14212220412.

It is not a de Polignac number, because 21402221241 - 2²³ = 21393832633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21402221201) 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, 885901 + ... + 909738.

It is an arithmetic number, because the mean of its divisors is an integer number (1858487400).

Almost surely, 2^21402221241 is an apocalyptic number.

It is an amenable number.

21402221241 is a deficient number, since it is larger than the sum of its proper divisors (8333577159).

21402221241 is a wasteful number, since it uses less digits than its factorization.

21402221241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795808.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21402221241 its reverse (14212220412), we get a palindrome (35614441653).

The spelling of 21402221241 in words is "twenty-one billion, four hundred two million, two hundred twenty-one thousand, two hundred forty-one".