21011473626 has 32 divisors (see below), whose sum is σ = 49369618368. Its totient is φ = 5877335040.

The previous prime is 21011473621. The next prime is 21011473631. The reversal of 21011473626 is 62637411012.

It is an interprime number because it is at equal distance from previous prime (21011473621) and next prime (21011473631).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21011473621) 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, 12243591 + ... + 12245306.

It is an arithmetic number, because the mean of its divisors is an integer number (1542800574).

Almost surely, 2^21011473626 is an apocalyptic number.

21011473626 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21011473626 is an abundant number, since it is smaller than the sum of its proper divisors (28358144742).

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

21011473626 is a wasteful number, since it uses less digits than its factorization.

21011473626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24488926.

The product of its (nonzero) digits is 12096, while the sum is 33.

Adding to 21011473626 its reverse (62637411012), we get a palindrome (83648884638).

The spelling of 21011473626 in words is "twenty-one billion, eleven million, four hundred seventy-three thousand, six hundred twenty-six".