21365561100354 has 32 divisors (see below), whose sum is σ = 42941578873536. Its totient is φ = 7086790072320.

The previous prime is 21365561100319. The next prime is 21365561100437. The reversal of 21365561100354 is 45300116556312.

It is a happy number.

It is a super-2 number, since 2×21365561100354² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5300194 + ... + 8415650.

It is an arithmetic number, because the mean of its divisors is an integer number (1341924339798).

Almost surely, 2^{21365561100354} is an apocalyptic number.

21365561100354 is an abundant number, since it is smaller than the sum of its proper divisors (21576017773182).

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

21365561100354 is a wasteful number, since it uses less digits than its factorization.

21365561100354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121090.

The product of its (nonzero) digits is 324000, while the sum is 42.

Adding to 21365561100354 its reverse (45300116556312), we get a palindrome (66665677656666).

The spelling of 21365561100354 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred sixty-one million, one hundred thousand, three hundred fifty-four".