21226401013155 has 48 divisors (see below), whose sum is σ = 36836270392320. Its totient is φ = 10432704057984.

The previous prime is 21226401013099. The next prime is 21226401013159. The reversal of 21226401013155 is 55131010462212.

It is not a de Polignac number, because 21226401013155 - 2¹⁵ = 21226400980387 is a prime.

It is a super-2 number, since 2×21226401013155² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21226401013159) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5358565 + ... + 8436054.

It is an arithmetic number, because the mean of its divisors is an integer number (767422299840).

Almost surely, 2^{21226401013155} is an apocalyptic number.

21226401013155 is a deficient number, since it is larger than the sum of its proper divisors (15609869379165).

21226401013155 is a wasteful number, since it uses less digits than its factorization.

21226401013155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13795260 (or 13795247 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

Adding to 21226401013155 its reverse (55131010462212), we get a palindrome (76357411475367).

The spelling of 21226401013155 in words is "twenty-one trillion, two hundred twenty-six billion, four hundred one million, thirteen thousand, one hundred fifty-five".