21142020402 has 24 divisors (see below), whose sum is σ = 46252449984. Its totient is φ = 6978918744.

The previous prime is 21142020401. The next prime is 21142020413. The reversal of 21142020402 is 20402024112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21142020401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5699878 + ... + 5703585.

It is an arithmetic number, because the mean of its divisors is an integer number (1927185416).

Almost surely, 2^21142020402 is an apocalyptic number.

21142020402 is an abundant number, since it is smaller than the sum of its proper divisors (25110429582).

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

21142020402 is a wasteful number, since it uses less digits than its factorization.

21142020402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11403574 (or 11403571 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21142020402 its reverse (20402024112), we get a palindrome (41544044514).

The spelling of 21142020402 in words is "twenty-one billion, one hundred forty-two million, twenty thousand, four hundred two".