21020091462 has 96 divisors (see below), whose sum is σ = 48080148480. Its totient is φ = 6881643360.

The previous prime is 21020091427. The next prime is 21020091493. The reversal of 21020091462 is 26419002012.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7299739 + ... + 7302617.

It is an arithmetic number, because the mean of its divisors is an integer number (500834880).

Almost surely, 2^21020091462 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020091462, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24040074240).

21020091462 is an abundant number, since it is smaller than the sum of its proper divisors (27060057018).

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

21020091462 is a wasteful number, since it uses less digits than its factorization.

21020091462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160 (or 3148 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 21020091462 its reverse (26419002012), we get a palindrome (47439093474).

The spelling of 21020091462 in words is "twenty-one billion, twenty million, ninety-one thousand, four hundred sixty-two".