21532401215402 has 48 divisors (see below), whose sum is σ = 40989364273440. Its totient is φ = 8388858492000.

The previous prime is 21532401215389. The next prime is 21532401215407. The reversal of 21532401215402 is 20451210423512.

It is not an unprimeable number, because it can be changed into a prime (21532401215407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23381777 + ... + 24285227.

It is an arithmetic number, because the mean of its divisors is an integer number (853945089030).

Almost surely, 2^{21532401215402} is an apocalyptic number.

21532401215402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21532401215402 is a deficient number, since it is larger than the sum of its proper divisors (19456963058038).

21532401215402 is a wasteful number, since it uses less digits than its factorization.

21532401215402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925587 (or 925580 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 21532401215402 its reverse (20451210423512), we get a palindrome (41983611638914).

The spelling of 21532401215402 in words is "twenty-one trillion, five hundred thirty-two billion, four hundred one million, two hundred fifteen thousand, four hundred two".